Bluetooth Communication Apparatus Periodic Scan Frame Power Reduction
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Solution Overview
Problem
Bluetooth devices in standby mode consume significant battery power due to ongoing inquiry and page scans, which is undesirable for unconnected devices.
Innovation Solution
A communication apparatus comprising an RF module, down converter, and detector that alternately sweeps a plurality of scan trains during a scan frame, allowing for efficient detection of ID packets without scanning all channels, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Bluetooth devices perform continuous inquiry and page scans in standby mode, then device connectivity and response capability are improved, but battery power consumption increases significantly
Solution Approach 1:
The patent implements periodic scanning by dividing the scan window into multiple sub-windows and performing scans only during these periodic intervals rather than continuously. The device alternates between active scanning periods and sleep periods, reducing overall power consumption while maintaining connectivity reliability through regular periodic checks.
Solution Approach 2:
The scan window is segmented into multiple sub-windows, and the scanning process is divided into inquiry scan and page scan phases. This segmentation allows the device to perform scans in distributed intervals rather than continuous operation, enabling power management during standby mode while maintaining detection capability.
2Productivity
If Bluetooth devices perform scans at high speed to improve detection rate, then response time is reduced, but power consumption increases
Solution Approach 1:
The patent applies periodic action by organizing scans into periodic sub-windows within the scan window. This allows high-speed scanning during active periods while incorporating sleep periods between scans, achieving high detection rates during scanning intervals while reducing average power consumption through periodic operation patterns.
3Measurement precision
If Bluetooth devices extend scan window duration to improve detection coverage, then detection sensitivity is improved, but time spent in high-power state increases
Solution Approach 1:
The patent segments the scan window into multiple sub-windows distributed over time. This segmentation allows the device to achieve comprehensive detection coverage by scanning across multiple intervals rather than extending a single continuous scan, reducing the duration of high-power states while maintaining detection sensitivity through distributed scanning opportunities.
Data Source
AI summary
A communication apparatus is provided. The communication apparatus includes an RF module for receiving an RF signal, and a down converter, coupled to the RF module, for down converting the RF signal in response to a channel select signal to generate a converted signal. The channel select signal controls the down converter to sweep a plurality of scan trains during a scan frame, and each of the scan trains comprises a plurality of channels, wherein a total channel number of the plurality of scan trains is N, where 32≦N≦78. The communication apparatus also includes a detector, coupled to the down converter, for determining whether the RF signal comprises an ID packet according to the converted signal corresponding to the channels of the plurality of scan trains.