PUSCH Transform Precoding Control for Dynamic Waveform Switching

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Solution Overview

Problem

Ambiguity in terminal operation due to the newly supported dynamic waveform switching operation in mobile communication systems, particularly in determining whether transform precoding is enabled or disabled for uplink waveforms.

Innovation Solution

A method for determining transform precoding for Physical Uplink Shared Channel (PUSCH) based on Downlink Control Information (DCI) formats and higher layer parameters, using explicit N-bit indication fields in DCI formats 0_1 and 0_2 to clearly define when transform precoding is enabled or disabled.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If dynamic waveform switching operation is supported, then adaptability of uplink waveform is improved, but ambiguity in terminal operation occurs

Engineering Contradiction:

Improveuplink waveform adaptabilityVSAvoidterminal operation clarity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the waveform indication into separate fields: a transform precoding indicator field in DCI format 0_0 and a waveform indicator field in DCI format 0_1. This segmentation allows clear distinction between semi-static and dynamic waveform configurations, resolving the ambiguity that arises when dynamic waveform switching is supported.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary mechanism - the transform precoding indicator field in DCI format 0_0 - that mediates between semi-static RRC configuration and dynamic DCI scheduling. This intermediary provides a clear indication that resolves conflicts between different waveform configurations and ensures unambiguous terminal operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If transform precoding indication is provided through both RRC signaling and DCI, then flexibility is improved, but configuration conflict occurs

Engineering Contradiction:

Improvewaveform configuration flexibilityVSAvoidconfiguration management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by providing the transform precoding indicator in DCI format 0_0 before the actual PUSCH transmission. This early indication allows the terminal to prepare the correct waveform configuration in advance, avoiding conflicts that would arise from simultaneous or conflicting indications from different signaling layers.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamics by allowing the waveform configuration to transition from semi-static (RRC) to dynamic (DCI) based on the presence and value of the transform precoding indicator. When the indicator is present and set to a specific value, it dynamically overrides the semi-static configuration, providing flexibility while maintaining clear operational rules.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP4668687A1Method and apparatus for transmitting and receiving uplink in wireless communication system

Publication Date: 2025.12.24 LG ELECTRONICS INC

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AI summary

A method according to an embodiment of the present disclosure incudes receiving configuration information related to PUSCH, receiving DCI for scheduling the PUSCH, and transmitting the PUSCH. Based on a DCI format related to the DCI and/or the configuration information, whether a transform precoding for the PUSCH is enabled is determined based on the DCI or a higher layer parameter.