Cross-Waveform Interference Measurement for Air-to-Ground CSI Reporting
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Solution Overview
Problem
Existing wireless communication systems face challenges in addressing air to ground (ATG) interference due to mismatched waveforms and time alignment between terrestrial and ATG systems, leading to interference measurement difficulties for terrestrial user equipment (UE).
Innovation Solution
Configuring user equipment (UE) to measure interference on a different waveform than the one used for downlink communications, with specific configuration information including time domain drifting, to enable effective channel and interference measurement and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terrestrial UE measures interference on the same waveform used for downlink communications, then measurement simplicity is improved, but interference from ATG waveforms cannot be detected
Solution Approach 1:
The patent segments the measurement process into two distinct parts: channel measurement on the first waveform (used for downlink communications) and interference measurement on the second waveform (used for ATG interference detection). This segmentation allows the UE to separately measure and report channel quality and interference levels, enabling accurate detection of ATG interference without compromising the simplicity of downlink communication measurements.
Solution Approach 2:
The patent introduces an intermediary mechanism through configuration information from the base station that specifies separate resources for channel measurement and interference measurement. This intermediary configuration enables the UE to distinguish between desired downlink signals and interfering ATG signals by measuring them on different waveforms, thereby improving interference measurement accuracy while maintaining system manageability through structured configuration.
2Measurement precision
If separate channel and interference measurement resources are configured, then interference detection capability is improved, but signaling overhead increases
Solution Approach 1:
The patent applies universality by designing the configuration information structure to serve multiple functions simultaneously. The same configuration message from the base station not only assigns channel measurement resources but also assigns interference measurement resources on different waveforms. This multi-functional configuration approach enables improved interference detection capability while minimizing signaling overhead by consolidating multiple measurement assignments into a unified configuration framework.
3Reliability
If UE monitors multiple waveforms for interference, then ATG interference mitigation is improved, but processing complexity increases
Solution Approach 1:
The patent applies local quality by having the UE apply different measurement and processing characteristics to different waveforms. Specifically, the UE measures channel quality on the first waveform using parameters optimized for downlink communications, while simultaneously measuring interference on the second waveform using parameters optimized for ATG interference detection. This localized optimization for each waveform type improves ATG interference mitigation while managing processing complexity through specialized rather than universal processing approaches.
Data Source
AI summary
A method includes: communicating with a base station using a first waveform; receiving configuration information specifying an interference measurement resource associated with a second waveform different from a channel measurement resource associated with the first waveform; performing channel measurement associated with the first waveform and interference measurement associated with the second waveform, according to the configuration information; and providing channel state information (CSI) feedback to the base station, the CSI feedback based at least in part on the channel measurement and the interference measurement.