Hierarchical Beam Search for Wireless Devices
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Solution Overview
Problem
Beamforming scanning in wireless communication systems is time-consuming and energy-intensive, particularly for devices near the cell edge, due to the need for extensive synchronization and signal processing by the baseband integrated circuit (BBIC), leading to significant power consumption and resource utilization.
Innovation Solution
A hierarchical beam search method is introduced, where the radio frequency frontend (RFFE) and transceiver perform initial scans without the BBIC, filtering out weak signals, and only the BBIC decodes promising beams, reducing power consumption and accelerating the beam acquisition process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the BBIC performs extensive synchronization and signal processing during beamforming scanning, then beam acquisition accuracy is improved, but power consumption increases significantly
Solution Approach 1:
The beamforming scanning process is segmented into multiple stages with different processing requirements. The RFFE performs initial broadband scanning to identify candidate beams, then the BBIC performs targeted decoding only on promising beams. This segmentation allows the BBIC to remain in low-power mode during most of the scanning process while still achieving accurate beam acquisition.
Solution Approach 2:
The RFFE performs preliminary scanning and signal metric measurements before the BBIC engages for detailed decoding. By pre-identifying candidate beams through broadband power detection and signal strength measurement, the system prepares the necessary information ahead of time, allowing the BBIC to skip unnecessary processing and focus only on the most promising beams.
2Measurement precision
If the BBIC actively decodes all beams during scanning, then beam selection accuracy is improved, but processing time and resource utilization increase
Solution Approach 1:
Instead of the BBIC decoding all possible beams (excessive action), the system uses RFFE-based signal metric measurements to identify a subset of promising beams, then the BBIC decodes only those (partial action). This partial decoding approach maintains sufficient beam selection accuracy while dramatically reducing processing time and computational resources required.
Solution Approach 2:
The RFFE acts as an intermediary between the antenna array and the BBIC. It performs initial signal metric measurements and identifies candidate beams, then passes only the necessary information to the BBIC for final decoding. This intermediary role filters out unnecessary processing tasks, reducing overall scanning time while maintaining accuracy.
3Speed
If the BBIC remains in active mode throughout the scanning process, then real-time beam acquisition is ensured, but energy consumption increases
Solution Approach 1:
The BBIC operates periodically rather than continuously - it engages only during specific phases when decoding is required and remains in low-power mode during other phases. The scanning process is organized into periodic cycles where the RFFE performs initial scanning, then the BBIC activates only when needed to decode candidate beams, creating a periodic active-low power pattern that reduces overall energy consumption while maintaining acceptable acquisition speed.
Data Source
AI summary
In a communication device and corresponding methods, a hierarchical, reduced power, beam search process includes a hierarchical activation of the radio frequency frontend (RFFE), transceiver, and baseband integrated circuit (BBIC) for a beam searching operations. For example, a first signal metric measurements can be performed to determine signal information. An operating mode can be determined based on the signal information. In a first operating mode, one or more second signal metric measurements can be performed for a subset of beamforming configurations of the wireless communication device to determine beamforming information. In a second operating mode, one or more third signal metric measurements can be performed on the beamforming configurations to determine the beamforming information.