Partitioned Beam Search Using RASI for Fast Beam Alignment
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Solution Overview
Problem
Existing beam management techniques in wireless communication systems, particularly in 5G, face challenges in quickly and accurately determining the optimal beam direction for user equipment (UE) due to synchronization errors and channel effects, leading to longer search times and potential beam determination errors.
Innovation Solution
A method and apparatus that utilize a Received Attention Strength Indication (RASI) signal to determine the beam direction by measuring correlation and signal-to-noise ratio (SNR), adjusting beam alignment based on RASI information, and employing partitioned areas for beam search, allowing for rapid and accurate beam direction determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional beam search methods are used, then beam direction can be determined, but search time is long due to synchronization errors and channel effects
Solution Approach 1:
The system performs preliminary actions by transmitting RASI signals through multiple partitioned areas before final beam determination. The receiving node measures correlation and SNR for each partitioned area in advance, allowing the transmitting node to identify the optimal partitioned area quickly without exhaustive beam searching, thus reducing search time while maintaining accuracy.
Solution Approach 2:
The beam search space is segmented into multiple partitioned areas (e.g., first, second, third partitioned areas). Instead of searching all possible beam directions uniformly, the system divides the search space and transmits RASI signals to specific partitioned areas based on configuration information, reducing the number of measurements needed and accelerating beam direction determination.
2Measurement precision
If exhaustive beam search is performed to ensure accurate beam direction, then measurement precision improves, but search time increases
Solution Approach 1:
The system performs partial beam search by focusing measurements on selected partitioned areas rather than all possible beam directions. Configuration information guides the transmission of RASI signals to specific partitioned areas where the receiving node is most likely located, achieving sufficient measurement precision without the overhead of exhaustive searching.
Solution Approach 2:
The patent replaces traditional mechanical beam sweeping with a signal-based measurement system. Instead of physically sweeping beams through all directions, the system uses RASI signals with correlation measurement and SNR evaluation to electronically identify the optimal beam direction, significantly improving search efficiency while maintaining accuracy.
3Manufacturing precision
If beam search uses fine-grained beam directions, then beam alignment accuracy improves, but complexity of beam management increases
Solution Approach 1:
The beam management process is segmented into coarse beam search (partitioned area level) and fine beam alignment (specific beam direction within partitioned area). The transmitting node first identifies the optimal partitioned area using RASI measurements, then performs fine-tuned beam alignment within that partitioned area, reducing overall management complexity while achieving high alignment accuracy.
Solution Approach 2:
The system performs preliminary beam direction identification at the partitioned area level before finalizing the exact beam direction. Configuration information and RASI measurements provide advance guidance on which partitioned areas to focus on, allowing the system to skip unnecessary fine-grained measurements in irrelevant directions and reduce management complexity.
Data Source
AI summary
A method of a transmitting node may comprise: exchanging configuration information with a receiving node; generating a received attention strength indication (RASI) signal; transmitting the RASI signal to a receiving node through a coarse beam; receiving a measurement message including RASI information; identifying whether the receiving node is located within a selected partitioned area based on the RASI information included in the measurement message; and in response to the receiving node being located within the selected partitioned area, adjusting a beam direction for beam alignment based on the RASI information, wherein the RASI information includes an RASI measurement value obtained by measuring a correlation with a sequence included in the RASI signal and a reception SNR measurement value.