UE Search Space Beam Configuration for SBFD Interference Control

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Solution Overview

Problem

Existing wireless communication systems face performance loss due to improper beam application in both sub-band full duplex (SBFD) and non-SBFD resources, leading to interference and inefficiencies in downlink and uplink operations.

Innovation Solution

A method for user equipment (UE) and network devices that involve configuring search space sets with specific control resource sets (CORESETs) and transmission configuration indication states, associating them with serving cell identities and spatial receiver parameters to optimize beam management across SBFD and non-SBFD resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the same beam is used for DL reception in both SBFD and non-SBFD resources, then beam configuration is simplified, but performance loss occurs due to improper beam application

Engineering Contradiction:
Improvebeam configuration complexityVSAvoidDL reception performance
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent segments the beam configuration by creating separate TCI state configurations for SBFD and non-SBFD resources. The network device configures different TCI states (first TCI state for non-SBFD, second TCI state for SBFD) that are separately associated with different search space sets, allowing independent optimization of beam parameters for each resource type rather than using a single unified beam configuration.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by configuring specific beam parameters (spatial RX parameters, QCL assumptions) that are tailored to the local characteristics of each resource type. Different TCI states contain different reference signal associations and spatial parameters optimized for their respective resource types (SBFD vs non-SBFD), ensuring each resource receives appropriately localized beam quality rather than a generic configuration.

Inventive Principle:
Principle #3Local quality

2Object-affected harmful factors

If separate antenna panels are used for UL transmission and DL reception, then adjacent channel interference is reduced, but beam misalignment issues persist in SBFD resources

Engineering Contradiction:
Improveadjacent channel interferenceVSAvoidbeam alignment accuracy
Core Design Contradiction:
Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent introduces dynamic beam selection by configuring multiple TCI states that can be selectively applied based on resource type. The UE dynamically selects the appropriate TCI state (first or second) depending on whether the current resource is SBFD or non-SBFD, allowing the beam configuration to adapt dynamically to the specific resource characteristics rather than using a static single beam configuration.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent introduces TCI states as intermediary elements that mediate between the physical antenna panels and the actual beam formation. The TCI states contain QCL assumptions and spatial parameters that act as intermediate configuration layers, allowing the network to control beam behavior indirectly through configurable parameters rather than directly controlling panel switching, thus resolving beam alignment issues while maintaining panel separation benefits.

Inventive Principle:
Principle #24Intermediary (Mediator)

3Productivity

If DL and UL bands are allocated in the same symbols (SBFD), then spectral efficiency is improved, but interference between DL and UL increases

Engineering Contradiction:
Improvespectral efficiencyVSAvoidDL-UL interference
Core Design Contradiction:
ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent changes key beam parameters (spatial RX parameters, QCL assumptions, reference signal associations) separately for DL and UL operations within the same time symbols. By configuring different TCI states with different parameter sets for DL reception and UL transmission, the system can maintain SBFD spectral efficiency while using parameter changes to optimize each direction's beam characteristics and minimize mutual interference.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS20250350431A1Method used by user equipment, method used by network device, and user equipment
Publication Date: 2025.11.13 ACER INC
  • US20250350431A1 patent drawing
  • US20250350431A1 patent drawing
  • US20250350431A1 patent drawing

AI summary

A method used by a user equipment, a method used by a network device, and a user equipment are provided. In the method, a search space (SS) set configuration is received, and a downlink control information (DCI) is received according to the SS set configuration. An SS set is configured with a first control resource set (CORESET). The first CORESET is configured with a first transmission configuration indication (TCI) state. The first CORESET is associated with a serving cell identity (ID). The first TCI state is configured with one reference reference signal (RS). The reference RS is associated with a spatial receiver (RX) parameter.