LTE Reference Signal Segmentation for Transient Distortion

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Solution Overview

Problem

In LTE systems, known signal distortions, particularly due to transient periods and ON/OFF time masks, lead to increased overhead and loss of orthogonality between reference signals, affecting performance and efficiency.

Innovation Solution

The method involves generating signals with repeating segments based on known signal distortions, allowing for discarding of distorted portions to maintain orthogonality, using techniques like zeroing out symbols in IFDMA designs and selecting appropriate repetition factors to minimize performance impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If reference signals are transmitted continuously without considering transient periods, then signal coverage is improved, but orthogonality between reference signals is lost and performance deteriorates

Engineering Contradiction:

Improvesignal transmission reliabilityVSAvoidsignal distortion impact

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The reference signal transmission is segmented into multiple parts: valid reference signal portions and discarded portions corresponding to transient periods. The transmitter divides the transmission into segments that avoid distorted regions, while the receiver discards specific portions affected by transient periods. This segmentation allows the system to maintain orthogonality by excluding distorted segments from processing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The transmitter preliminarily identifies and marks the positions and durations of transient periods before reference signal transmission. By knowing in advance where distortions will occur, the transmitter can structure the reference signal transmission to avoid these regions, and the receiver can pre-configure which portions to discard, preventing performance degradation before it occurs.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If transient periods are avoided in reference signal transmission, then orthogonality is maintained, but overhead increases due to discarding signal portions

Engineering Contradiction:

Improveorthogonality maintenanceVSAvoidsignal overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The system changes the temporal parameters of reference signal transmission by introducing gaps or adjusting timing to avoid transient periods. By modifying when and how reference signals are transmitted rather than continuously, the system maintains orthogonality while minimizing the quantity of discarded signal portions, thus reducing overhead.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If repeating segments are used to compensate for distorted portions, then signal reliability is improved, but transmission time increases

Engineering Contradiction:

Improvesignal reception reliabilityVSAvoidtransmission time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The transmitter creates copies of reference signal segments and places them at specific positions within the transmission frame. These copied segments are strategically positioned to replace or compensate for portions that will be discarded due to transient periods. The receiver uses these copied segments to maintain reliable signal processing without requiring extended transmission time, as the redundancy is efficiently integrated into the existing frame structure.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS11356310B2Systems and methods for minimizing performance impact from known signal distortions

Publication Date: 2022.06.07 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

According to certain embodiments, a method in a wireless device includes generating a signal comprising repeating segments for transmission in a subslot duration transmission time interval (TTI) to a network node. The signal comprising the repeating segments is transmitted to the network node in the subslot duration TTI.