SBFD RACH Power Offsets for Downlink Interference Control
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Solution Overview
Problem
In subband full-duplex communication, existing methods for determining RACH transmission power in subband full-duplex (SBFD) symbols cause interference due to the same power levels being used for both SBFD and non-SBFD symbols, leading to potential interference with surrounding downlink signals.
Innovation Solution
A method and apparatus for determining RACH transmission power in SBFD symbols by applying an offset parameter, such as SBFD_Power_Offset, to adjust the power levels specifically for SBFD symbols, ensuring they do not exceed the maximum transmission power and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same power level is used for both SBFD and non-SBFD symbols, then transmission consistency is maintained, but interference with surrounding downlink signals occurs
Solution Approach 1:
The patent applies different power levels to different symbol types (SBFD vs. non-SBFD) based on their specific characteristics. SBFD symbols receive a reduced power level (applying an offset) to minimize interference with downlink signals, while non-SBFD symbols maintain the standard power level. This localized differentiation resolves the contradiction by allowing transmission consistency within each category while preventing harmful interference in specific contexts.
Solution Approach 2:
The patent changes the power parameter dynamically based on the symbol type. By introducing an offset parameter that is applied specifically to SBFD symbols, the system adjusts the transmission power to accommodate the full-duplex operation requirements. This parameter change enables the system to maintain reliability for non-SBFD transmissions while reducing interference for SBFD symbols.
2Object-affected harmful factors
If an offset is applied to reduce power for SBFD symbols, then interference is minimized, but transmission power may become insufficient for reliable communication
Solution Approach 1:
The patent implements dynamic power adjustment where the transmission power for SBFD symbols is adaptively reduced using an offset, while non-SBFD symbols maintain standard power levels. This dynamic approach allows the system to optimize power distribution based on the specific requirements of each symbol type, ensuring that interference is minimized for SBFD symbols without compromising the reliability of non-SBFD transmissions.
Solution Approach 2:
The patent applies quality differentiation by providing enhanced power protection for non-SBFD symbols while applying power reduction only to SBFD symbols. This local quality approach ensures that communication reliability is maintained where needed (non-SBFD) while interference is reduced where appropriate (SBFD), resolving the contradiction between these two requirements.
3Measurement precision
If separate RACH resource configurations are used for SBFD and non-SBFD symbols, then power control precision is improved, but system complexity increases
Solution Approach 1:
The patent merges the RACH resource configuration into a single unified structure that serves both SBFD and non-SBFD symbols. Instead of maintaining separate configurations, the system uses one RACH resource configuration with an additional offset parameter that is applied conditionally based on the symbol type. This merging approach maintains power control precision by preserving the distinction between symbol types while reducing system complexity through configuration consolidation.
Solution Approach 2:
The single RACH resource configuration is designed to be universal, serving both SBFD and non-SBFD symbols through multi-functionality. The configuration includes an offset parameter that can be applied selectively depending on the symbol type, allowing the same configuration structure to handle different power control requirements without requiring separate configurations for each symbol type.
Data Source
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Figure 3A~3C
AI summary
Provided are a method and apparatus for determining RACH transmission power in subband full-duplex communication. The method of terminal may include receiving a single piece of random access channel (RACH) resource information, selecting a first RACH occasion belonging to a subband full duplex (SBFD) symbol based on the received single piece of RACH resource information, and determining RACH transmission power for the selected first RACH occasion by applying an offset for the SBFD symbol.