EIRP-Constrained CSI Reporting for Accurate Channel Estimation
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Solution Overview
Problem
Existing EIRP-constrained communication systems face challenges in accurate channel quality estimation and high complexity due to power back-off requirements, necessitating protocol updates and increased signaling overhead.
Innovation Solution
A method involving determining power back-off values based on EIRP limits to estimate channel quality, including configuring UE with EIRP-constrained CSI reporting, which allows for accurate channel quality estimation without protocol updates or extra signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power back-off is applied to meet EIRP limits, then interference to other wireless devices is reduced, but channel quality estimation accuracy deteriorates
Solution Approach 1:
The base station determines and notifies the UE of power back-off values before the UE performs channel quality estimation. This allows the UE to compensate for the power back-off effect in advance, maintaining estimation accuracy while the base station meets EIRP limits by applying power back-off to reference signals and data channels.
Solution Approach 2:
The base station notifies the UE of the determined power back-off values through feedback signaling. This feedback mechanism enables the UE to adjust its channel quality estimation based on the actual power back-off applied, ensuring accurate estimation despite the reduced transmission power used to minimize interference.
2Object-affected harmful factors
If existing EIRP-constrained communication methods are used, then interference is reduced, but system complexity increases due to protocol updates and signaling overhead
Solution Approach 1:
The patent introduces power back-off values as adjustable parameters that the base station determines and notifies to the UE. By changing these power parameters dynamically, the system can meet EIRP limits without requiring complex protocol updates. The power back-off values are integrated into existing signaling mechanisms, avoiding additional signaling overhead while maintaining simplicity.
3Illumination intensity
If beamforming is used to reinforce signal power, then signal quality at UE is improved, but EIRP limits may be exceeded causing interference to other devices
Solution Approach 1:
The patent applies power back-off selectively to different signal components (reference signals and data channels) based on their local requirements. The base station determines separate power back-off values for reference signals and data channels, allowing beamforming to maintain signal quality at the target UE while applying appropriate power reduction to prevent interference to other devices in different spatial locations.
Data Source
AI summary
Embodiments of the present disclosure provide method and apparatus for EIRP-constrained communication. A method performed by a network device includes determining a first power back-off value for a transmission of a signal based on an effective isotropic radiated power (EIRP) limit. The method further includes determining a second power back-off value for a transmission of a channel based on the EIRP limit. The method further includes transmitting the signal to a terminal device based on the first power back-off value. The method further includes receiving a channel state information report from the terminal device. The method further includes estimating a channel quality of the transmission of the channel based on the channel state information report, the first power back-off value and the second power back-off value.