Frequency Range Switching for Wireless Signal Reliability
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Solution Overview
Problem
High-frequency bands beyond 52.6 GHz face challenges such as increased free-space attenuation, oxygen absorption, and sensitivity to antenna misalignment and line-of-sight blockages, which affect the reliability of wireless connections, especially in heterogeneous networks with dynamic frequency switching requirements.
Innovation Solution
The method involves seamless switching between frequency ranges by measuring channel state information reference signal resources in higher frequency ranges and switching to lower frequency ranges when signal quality falls below a threshold, using CSI-RS resources associated across different frequency ranges to ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency bands beyond 52.6 GHz are used, then data rate is improved, but free-space attenuation and oxygen absorption increase
Solution Approach 1:
The system dynamically changes the operating frequency parameter based on channel conditions. When signal quality deteriorates due to attenuation, the system switches from high-frequency bands (FR3) to lower-frequency bands (FR1 or FR2), thereby adapting the frequency parameter to maintain reliable communication while preserving high data rate capability when conditions permit
2Productivity
If high-frequency bands beyond 52.6 GHz are used, then data rate is improved, but sensitivity to antenna misalignment increases
Solution Approach 1:
The system implements feedback through CSI-RS measurements that continuously monitor signal quality. When misalignment causes degradation in signal quality metrics (such as reference signal received power or signal-to-interference-plus-noise ratio), the feedback mechanism triggers a frequency switch to a more robust lower-frequency band, thereby maintaining reliability while preserving high data rate operation under good alignment conditions
3Productivity
If highly directional antennas are used in beyond-52.6 GHz systems, then beamforming performance is improved, but sensitivity to line-of-sight blockage increases
Solution Approach 1:
The system dynamically adapts its operating frequency based on the propagation environment. When NLOS conditions or LOS blockages are detected through CSI-RS measurements, the system transitions from high-frequency FR3 to lower-frequency FR1 or FR2, which provide more robust propagation characteristics. This dynamic frequency adaptation allows the system to maintain beamforming performance in clear-line-of-sight conditions while ensuring reliability under blockage scenarios
4Reliability
If seamless switching between frequency ranges is implemented, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary configuration by pre-establishing associations between CSI-RS resources in different frequency ranges and pre-configuring measurement parameters and switching thresholds. This preliminary setup reduces the complexity of real-time decision-making during frequency switching, as the system only needs to evaluate pre-defined criteria rather than performing complex analysis during transitions
Data Source
AI summary
Methods and apparatuses for seamless switching between frequency ranges are provided herein. A method may include: receiving information identifying channel state information (CSI) reference signal (CSI-RS) resources in a first frequency range (FR), where each of the CSI-RS resources in the first FR is associated with CSI-RS resources in a second FR and the second FR is a lower FR than the first FR; and measuring a signal quality of at least one of the CSI-RS resources in the first FR. The method may further include selecting a subset of the CSI-RS resources in the first FR or the second FR, wherein, on a condition that the measured signal quality meets or exceeds a threshold, the selected subset is in the first FR, and the selection is based on the measured signal quality. The method may further include reporting the measured signal quality.