PDSCH Transmission Configuration Mapping for Multi-TRP Scheduling

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Solution Overview

Problem

In multi-TRP transmission scenarios, existing technologies face challenges in efficiently scheduling and coordinating PDSCH transmissions across multiple transmit/receive points, particularly in scenarios where the scheduling offset between PDCCH and PDSCH is below a threshold, leading to potential delays in processing DCI and determining the selected TCI state.

Innovation Solution

The proposed solution involves using default TCI states for PDSCH transmissions when specific conditions are met, such as a scheduling offset below a threshold and the presence of QCL Type D, which implies support for receive beamforming. This approach allows for the mapping of TCI states to resources using predefined options, ensuring accurate QCL relationships and enabling timely decoding of PDSCH transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If real-time processing of DCI is performed to determine selected TCI state, then transmission scheduling flexibility is improved, but processing delay increases when scheduling offset is below threshold

Engineering Contradiction:

Improvetransmission scheduling flexibilityVSAvoidprocessing delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by configuring default TCI states in advance through RRC signaling before DCI reception. When the scheduling offset is below a threshold, the UE directly uses these pre-configured default TCI states without performing real-time processing to determine selected TCI state, thereby reducing processing delay while maintaining scheduling flexibility through the threshold-based mechanism.

Inventive Principle:

Principle #10Preliminary action

2Loss of time

If default TCI states are used for PDSCH transmissions, then processing delay is reduced, but transmission configuration accuracy may worsen

Engineering Contradiction:

Improveprocessing delayVSAvoidtransmission configuration accuracy

Core Design Contradiction:

Loss of timeVSMeasurement precision

Solution Approach 1:

The patent applies dynamics by implementing a dynamic selection mechanism between default TCI states and selected TCI states based on the scheduling offset threshold. When the threshold condition is met, default TCI states are used for faster processing; otherwise, the UE performs real-time processing to determine selected TCI states for higher configuration accuracy. This dynamic adaptation resolves the contradiction between speed and accuracy.

Inventive Principle:

Principle #15Dynamics

3Productivity

If multi-TRP transmission is coordinated through single DCI, then scheduling efficiency is improved, but complexity of coordinating multiple TRPs increases

Engineering Contradiction:

Improvescheduling efficiencyVSAvoidcoordination complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the multi-TRP coordination into independent transmission occasions, where each occasion can be associated with different TCI states. The DCI format is designed to indicate TCI states for different transmission occasions separately, allowing the UE to process each occasion independently. This segmentation reduces coordination complexity while maintaining scheduling efficiency across multiple TRPs.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12294994B2Transmission configuration indication and transmission occasion mapping

Publication Date: 2025.05.06 APPLE INC

AI summary

The present application relates to devices and components including apparatus, systems, and methods for mapping transmission configuration indicator states to resources of physical downlink shared channel transmission occasions in wireless communication systems.