Terminal PDSCH Transmission With Configuration-Based TCI Selection

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Solution Overview

Problem

In the New Radio (NR) system, there is no solution for a terminal device to determine a usable Transmission Configuration Indicator (TCI) state when configured with multiple time domain resource units for Physical Downlink Shared Channel (PDSCH) transmission, which affects the reliability and throughput of PDSCH transmission.

Innovation Solution

The terminal device determines a TCI state for PDSCH transmission based on information such as the number of code division multiplexing (CDM) groups to which a demodulation reference signal (DMRS) port belongs, the PDSCH repetition transmission scheme, and the configuration of multiple time domain resource units, without introducing new signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple time domain resource units are configured for PDSCH transmission, then transmission reliability is improved through diversity gain, but the terminal device cannot determine a usable TCI state without new signaling

Engineering Contradiction:

ImprovePDSCH transmission reliabilityVSAvoidTCI state determination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The terminal device autonomously determines the TCI state based on existing configuration information including the number of CDM groups, PDSCH repetition transmission scheme, configuration scheme for the number of multiple time domain resource units, and physical resource configuration, without requiring additional signaling from the network side

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent utilizes different parameters from the existing configuration information to determine the TCI state. By changing the interpretation and combination of these parameters (CDM groups, repetition scheme, resource unit configuration, physical resource configuration), the terminal can derive the appropriate TCI state for different transmission scenarios

Inventive Principle:

Principle #35Parameter changes

2Reliability

If multiple TCI states are configured for PDSCH transmission, then transmission reliability is improved, but signaling overhead increases

Engineering Contradiction:

ImprovePDSCH transmission reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts the TCI state determination logic from the signaling process and embeds it within the existing configuration information structure. By taking out the need for separate TCI state indication signaling and integrating it into the existing parameter set, the solution reduces signaling overhead while maintaining the ability to support multiple TCI states for improved reliability

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12407459B2Method used for transmitting data, and terminal device

Publication Date: 2025.09.02 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A method for transmitting data includes: a terminal device receives DCI, wherein the DCI is used for scheduling PDSCH transmission in multiple time domain resource units, and the DCI is further used for indicating K TCI states, and K is a positive integer; and the terminal device determines, from the K TCI states, a TCI state used for the PDSCH transmission in the multiple time domain resource units according to at least one of following information: the number of CDM groups to which an adopted DMRS port belongs, a configuration of PDSCH repetition transmission scheme, a configuration scheme for the number of the multiple time domain resource units, and a physical resource configuration in one time domain resource unit of the multiple time domain resource units.