Multi-TRP PUSCH Repetition Control Using Single DCI

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Solution Overview

Problem

In next-generation mobile communication systems, the study of PUSCH repetition transmission in multi-TRP environments has not been fully conducted, leading to potential reductions in throughput and deterioration of communication quality.

Innovation Solution

A terminal and base station are designed to control UL transmission using spatial relation information for multiple PUSCHs through a single DCI, enabling transmission with spatial domain filters based on this information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PUSCH repetition transmission is performed in multi-TRP environments without proper control mechanisms, then transmission diversity is improved, but throughput is reduced and communication quality deteriorates

Engineering Contradiction:

Improvecommunication qualityVSAvoidthroughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting spatial relation information parameters for different PUSCH repetitions. The control section determines specific spatial relation parameters (such as beam directions, spatial filters) for each repetition based on multi-TRP configurations, transforming the transmission parameters to optimize both reliability and throughput in multi-TRP environments

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the PUSCH transmission into multiple repetitions, each with independently controlled spatial relation information. By dividing the transmission into discrete repetition units with distinct spatial parameters, the system can optimize each repetition's transmission characteristics for different TRPs, thereby improving overall communication quality and throughput

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If multiple PUSCH transmissions are controlled with separate DCIs, then transmission control flexibility is improved, but control signaling overhead increases

Engineering Contradiction:

Improvetransmission control flexibilityVSAvoidcontrol signaling overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent merges the control of multiple PUSCH transmissions into a single DCI message. The control section determines spatial relation information for multiple PUSCH repetitions using one DCI, combining what would otherwise require separate control messages. This reduces control signaling overhead while maintaining the flexibility to control each repetition's transmission characteristics through appropriately structured parameters within the unified DCI

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12513678B2Terminal, method, base station, and system for performing repetitive transmission of physical uplink shared channel (PUSCH)

Publication Date: 2025.12.30 NTT DOCOMO INC

AI summary

A terminal according to an aspect of the present disclosure includes a control section that determines spatial relation information for a plurality of uplink shared channels (Physical Uplink Shared Channels (PUSCHs)) by using a single downlink control information (DCI), and a transmitting section that transmits the plurality of PUSCHs by using a spatial domain transmission filter based on the spatial relation information. According to an aspect of the present disclosure, even when multi-TRP is used, UL transmission can be appropriately controlled.