UE TCI State Application Across CORESET Search Space Types

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Solution Overview

Problem

In conventional 3GPP 5G NR networks, the application of transmission configuration indication (TCI) states by user equipment (UE) is not fully defined, leading to uncertainties in how UE should apply these states for control resource sets and search space sets.

Innovation Solution

The UE receives an indication of a specific TCI state from the network, which it applies for receptions corresponding to control resource sets associated with search space sets of certain types, ensuring clear application guidelines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the UE is configured with multiple TCI states and search space sets, then the network can provide flexible transmission configurations, but the uncertainty in applying TCI states leads to reduced reliability

Engineering Contradiction:

Improvetransmission configuration flexibilityVSAvoidTCI state application reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies parameter changes by dynamically selecting which TCI state to apply based on the search space set type parameter. When the search space set type indicates unified TCI, the UE applies the indicated TCI state to both PDCCH and PDSCH receptions, thereby adapting the transmission configuration parameters according to the configured search space set type.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the UE applies TCI states to all search space sets, then comprehensive coverage is achieved, but the complexity of determining application rules increases

Engineering Contradiction:

Improvereception coverageVSAvoidTCI state determination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the search space sets into different types (unified TCI and separate TCI). This segmentation allows the UE to apply different TCI state application rules based on the search space set type, thereby reducing the complexity of determining which TCI state to apply while ensuring comprehensive coverage for both types.

Inventive Principle:

Principle #1Segmentation

3Manufacturing precision

If the network provides detailed TCI state application rules, then the UE can apply configurations accurately, but the signaling overhead and configuration complexity increase

Engineering Contradiction:

ImproveTCI state application accuracyVSAvoidconfiguration complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent implements universality by using the search space set type as a multi-functional parameter that simultaneously determines both the PDCCH and PDSCH TCI state application behavior. This universal approach allows a single configuration parameter to control multiple aspects of TCI state application, thereby improving accuracy while reducing configuration complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12526798B2Method and user equipment for transmission configuration indication (TCI) state application

Publication Date: 2026.01.13 MEDIATEK INC

AI summary

Method and UE are provided for transmission configuration indication (TCI) state application. In particular, a UE can receive an indication of a specific TCI state from a network. Then the UE can apply the specific TCI state for at least one transmission in a CORESET associated with at least one search space set when: (1) the at least one search space set is configured with a first type; or (2) any of the at least one search space set is configured with a second type and the CORESET associated is configured to follow the specific TCI state.