Unified TCI State Switching for SBFD Beam and Power Control

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Solution Overview

Problem

Enabling sub-band full-duplex (SBFD) and non-SBFD operation in different transmission time intervals (TTIs) poses challenges due to varying channel conditions, requiring separate beam and power control strategies to mitigate interference.

Innovation Solution

A unified transmission configuration indication (TCI) state is configured for different duplex types, allowing separate TCI states for SBFD and non-SBFD symbols, enabling dynamic beam and power control to optimize communication performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If separate beam and power control strategies are used for SBFD and non-SBFD operations, then interference mitigation is improved, but device complexity increases

Engineering Contradiction:

Improveinterference mitigationVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent segments the transmission configuration by introducing separate TCI states for SBFD and non-SBFD operations. This allows the system to differentiate between full-duplex and half-duplex modes, applying specific beam and power control strategies tailored to each mode's interference characteristics, thereby improving interference mitigation without requiring complete system redesign

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic switching between different TCI states based on the operational mode (SBFD or non-SBFD). The network can dynamically select and indicate appropriate TCI states through DCI signaling, allowing the beam and power control configuration to adapt in real-time to changing duplexing requirements and interference conditions

Inventive Principle:

Principle #15Dynamics

2Reliability

If dynamic beam and power control is implemented for different duplex types, then communication performance is improved, but information overhead increases

Engineering Contradiction:

Improvecommunication performanceVSAvoidinformation overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent creates a unified TCI framework that serves multiple functions: it handles both SBFD and non-SBFD operations, incorporates both beam indication and power control parameters, and works across different duplexing modes. This multi-functional design improves communication performance while managing information overhead through a consolidated configuration approach rather than separate independent systems

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses DCI signaling to indicate TCI states that are pre-configured through RRC signaling. This copying mechanism allows the detailed TCI configurations to be established once through higher-layer signaling, then efficiently referenced and switched through lower-layer DCI signaling, reducing the repeated transmission of redundant information

Inventive Principle:

Principle #26Copying

3Device complexity

If unified TCI state configuration is used for different duplex types, then device complexity is reduced, but adaptability to varying channel conditions worsens

Engineering Contradiction:

Improvedevice complexityVSAvoidadaptability to channel conditions

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent segments the TCI configuration into mode-specific states (SBFD TCI states and non-SBFD TCI states), allowing the system to maintain a unified overall framework while incorporating specialized configurations for different duplexing modes. This segmentation enables the system to handle varying channel conditions appropriately for each mode without requiring completely separate configuration systems

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent enables adaptability to varying channel conditions by allowing different TCI parameters (such as beam directions, power control offsets, and interference mitigation settings) to be adjusted based on the operational mode and channel conditions. The network can select and indicate appropriate TCI states that match current channel characteristics, maintaining versatility within a unified configuration framework

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250393093A1Unified transmission configuration indication state for time intervals associated with different duplex types

Publication Date: 2025.12.25 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to techniques to configure and indicate separate transmission configuration indication (TCI) states under a unified TCI framework for sub-band full-duplex (SBFD) and non-SBFD intervals. Some aspects more specifically relate to configuring a unified TCI state type for each duplex type, and to configuring and indicating uplink and downlink TCI states for SBFD and non-SBFD intervals. For example, one or more TCI state pools may define candidate TCI states for SBFD and non-SBFD intervals, and various techniques may be used to indicate specific unified TCI states to be used in SBFD and non-SBFD intervals. In this way, a user equipment (UE) may be configured to communicate using different uplink and downlink beams in SBFD and non-SBFD intervals, and/or uplink power control may be configured separately for SBFD and non-SBFD intervals.