Beam Handling for Dynamic Antenna Configurations in SBFD
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Solution Overview
Problem
Existing solutions for beam handling in next-generation NodeB (gNB) systems do not effectively manage dynamic changes in antenna configurations during sub-band full duplex (SBFD) operations, leading to ambiguity in determining the appropriate beam for quasi co-location (QCL) parameter derivation, resulting in suboptimal performance and increased interference.
Innovation Solution
The proposed solution involves identifying effective reference signals (RSs) for QCL source RSs in transmission configuration indication (TCI) states, dividing periodic/semi-persistent RSs into multiple effective RSs based on antenna configurations, and implicitly or explicitly indicating time patterns for these effective RSs through higher-layer signaling, allowing for separate configuration of different QCL types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gNB uses dynamic antenna configurations in SBFD operations to optimize transmission performance, then signal quality and interference reduction are improved, but beam determination ambiguity and system complexity increase
Solution Approach 1:
The patent segments a single periodic or semi-persistent reference signal into multiple effective reference signals, each associated with specific antenna configurations. This segmentation allows the system to manage different beam configurations separately for different symbol types (SBFD vs. non-SBFD), resolving the ambiguity in beam determination while maintaining dynamic adaptability.
Solution Approach 2:
The patent introduces dynamic switching between different effective reference signals based on the antenna configuration state. The gNB can dynamically indicate which effective RS to use through higher-layer signaling, allowing the system to adapt to changing transmission scenarios (SBFD/non-SBFD) while providing clear beam determination rules.
2Object-affected harmful factors
If the gNB switches between different antenna configurations for SBFD and non-SBFD symbols to reduce interference, then transmission performance is optimized, but ambiguity in QCL source RS determination increases
Solution Approach 1:
The patent applies local quality by associating different effective reference signals with different antenna configuration scenarios. Each effective RS has specific QCL parameters tailored to its intended usage scenario (SBFD or non-SBFD), ensuring that the appropriate beam characteristics are used for each transmission type, thereby reducing interference while maintaining clarity.
Solution Approach 2:
The patent introduces higher-layer signaling as an intermediary mechanism that explicitly indicates which effective reference signal should be used for QCL parameter derivation. This intermediary resolves the ambiguity by providing clear, scenario-specific beam determination rules without requiring complex real-time decisions at the physical layer.
3Device complexity
If static antenna configurations are used to simplify beam management, then system complexity is reduced, but adaptability to dynamic transmission scenarios is limited
Solution Approach 1:
The patent creates a universal framework where a single periodic or semi-persistent reference signal serves multiple functions by being segmented into multiple effective reference signals. Each effective RS can be used for different antenna configurations, allowing the system to maintain simplicity in signal generation while achieving versatility in adaptation to different transmission scenarios.
Data Source
AI summary
A system and a method are disclosed for determining a quasi co-located (QCL) source reference signal (RS) to receive a target signal or channel. The method includes receiving antenna indicator information indicating one or more first antenna configurations and one or more second antenna configurations from a base station; identifying a first set of symbols at which the one or more first antenna configurations are applied and a second set of symbols at which the one or more second antenna configurations are applied; and receiving the target signal or channel using a version of the QCL source RS at a time instance based on whether the time instance occurs in the first set of symbols or the second set of symbols.