Bluetooth Frequency Scanning Using Preamble-Based Channel Detection
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Solution Overview
Problem
Bluetooth devices face a tradeoff between fast connection establishment and battery life due to the power-intensive nature of channel scanning, where frequent scanning reduces battery life but less frequent scanning increases connection delays.
Innovation Solution
Implementing a method where a listening device simultaneously scans multiple frequencies using one transceiver, alternating between frequencies based on captured preamble portions of received signals to determine if they are intended for the device, thereby reducing scanning time and power consumption while maintaining quick connection establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the listening device scans the channels more often to connect faster, then the connection speed is improved, but the battery life deteriorates due to increased power consumption
Solution Approach 1:
The patent divides the channel scanning process into segments by capturing only the preamble portion of signals rather than processing complete packets. This segmentation allows the device to quickly identify relevant channels without the power cost of processing full data packets, thereby improving connection speed while reducing energy consumption.
Solution Approach 2:
The patent applies partial action by performing only the necessary portion of the scanning task - capturing and analyzing just the preamble of received signals rather than processing complete packets. This partial approach provides sufficient information to identify target channels and establish connections faster, while significantly reducing the power consumption associated with processing entire data packets.
2Use of energy by moving object
If the listening device scans the channels less often to preserve battery, then the battery life is improved, but the connection delay increases
Solution Approach 1:
The patent performs preliminary action by capturing the preamble portion of signals in advance during scanning operations. This preliminary capture of identification information allows the device to quickly determine whether to establish connections without requiring extensive subsequent processing, thereby reducing connection delay while maintaining battery efficiency through less frequent but more effective scanning.
3Measurement precision
If the device captures the complete preamble and payload to ensure accurate signal identification, then the measurement precision is improved, but the power consumption increases
Solution Approach 1:
The patent applies partial action by capturing only the preamble portion of received signals rather than complete packets. The preamble contains sufficient identification information for the listening device to determine whether signals are intended for it, providing adequate measurement precision for connection establishment while significantly reducing power consumption compared to processing full packets.
Data Source
AI summary
Methods and systems for substantially simultaneously scan of two or more frequencies using one transceiver are discussed herein. For example, a listening device can include a controller configured to control its transceiver to alternate between two or more frequencies from two or more sets of frequencies. The controller is also configured to capture a portion of a preamble of a received signal to determine whether the received signal is intended for the listening device.