PUSCH Repetition With Implicit TPMI Selection for Multi-TRP Uplinks

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Solution Overview

Problem

Existing MIMO systems face challenges in efficiently utilizing multi-TRP transmission for channels other than PDSCH, particularly in enhancing reliability and robustness for PUSCH, where indicating TPMIs is not adequately addressed, leading to communication overhead.

Innovation Solution

A method where a network device transmits control information indicating a first and second TPMI index to a terminal device, allowing the terminal to determine the second TPMI based on configuration parameters, reducing communication overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multi-TRP transmission is implemented for PUSCH, then reliability and robustness are improved, but communication overhead increases due to inadequate TPMI indication mechanisms

Engineering Contradiction:

ImprovereliabilityVSAvoidcommunication overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent segments the TPMI indication into two parts: a first TPMI explicitly indicated in control information, and a second TPMI implicitly determined based on configuration parameters and codebook subsets. This segmentation reduces the total indication overhead while maintaining the functionality of multi-TRP transmission for PUSCH.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The terminal device autonomously determines the second TPMI based on pre-configured parameters and codebook subsets without requiring explicit network indication. This self-service mechanism reduces communication overhead while ensuring reliable multi-TRP transmission through proper precoding matrix selection.

Inventive Principle:

Principle #25Self-service

2Measurement precision

If explicit TPMI indication is used for all PUSCH transmissions, then transmission accuracy is improved, but device complexity and overhead increase

Engineering Contradiction:

Improvetransmission accuracyVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies different quality levels of TPMI indication to different transmission scenarios. For the first TPMI, explicit indication is used to ensure accuracy. For the second TPMI, implicit determination based on local configuration parameters is used, reducing overall complexity while maintaining necessary transmission accuracy.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameter of TPMI indication from always-explicit to conditional-explicit. The second TPMI is determined by changing from explicit indication to implicit calculation based on configuration parameters and codebook subsets, reducing device complexity while maintaining transmission accuracy through proper precoding.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12574942B2Method, device and computer readable medium for physical uplink shared channel repetition

Publication Date: 2026.03.10 NEC CORP

AI summary

Embodiments of the present disclosure relate to methods, devices and computer readable media for communication of a RS. According to embodiments of the present disclosure, the terminal device receives information indicating a set of resources for transmitting a reference signal from the network device. If the terminal device receives an indication in a first slot for triggering a transmission of the reference signal, the terminal device determines a second slot for transmitting the reference signal. The terminal device determines whether the second slot is valid based on a slot configuration. In this way, it can avoid the SRS transmission timing ambiguous or misalignment between terminal device and network.