Conditional Scanning for Bluetooth Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bluetooth devices face high power consumption due to the need to perform periodic page scans and inquiry scans, which require continuous monitoring of radio frequency bands for synchronization, leading to increased energy usage.
Innovation Solution
Implementing a conditional scanning method where the radio receiver is controlled for a short initial period to detect radio transmissions and determine if subsequent longer periods of data reception are necessary, allowing scans to be performed only if predetermined conditions are met, thereby reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic page scans and inquiry scans are performed to maintain synchronization, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic scanning by adjusting the radio receiver's operational state based on detected conditions. The system transitions between active scanning and idle states, making the scanning behavior adaptive rather than static. This resolves the contradiction by maintaining reliability when needed while reducing power consumption during normal operation.
Solution Approach 2:
The system uses its own detected radio transmissions to determine whether scanning should continue. By monitoring the presence of other devices' transmissions and autonomously deciding whether to maintain scanning mode, the system serves its own synchronization needs without requiring continuous external prompting, thereby reducing unnecessary power consumption.
2Measurement precision
If the radio receiver is kept active for continuous monitoring, then synchronization accuracy is improved, but operational time increases
Solution Approach 1:
The patent implements conditional periodic scanning where the radio receiver activates for short monitoring periods and then enters idle state. Instead of continuous operation, the system performs scanning periodically and only when conditions warrant it, based on detected radio transmissions. This maintains synchronization accuracy while dramatically reducing operational time.
Solution Approach 2:
The system performs preliminary detection of radio transmissions during short active periods before committing to longer scanning operations. By detecting the presence of other devices first, the system prepares for subsequent scanning only when necessary, avoiding unnecessary prolonged operational time while maintaining synchronization when devices are present.
3Speed
If scans are performed frequently to detect transmissions, then connection establishment speed is improved, but power consumption increases
Solution Approach 1:
The patent makes scanning frequency dynamic rather than fixed. The system adjusts scanning behavior based on detected conditions - performing scans when radio transmissions are detected and reducing scanning when the environment is quiet. This maintains connection establishment speed when needed while reducing power consumption during normal idle periods.
Solution Approach 2:
The system uses feedback from detected radio transmissions to control scanning behavior. When transmissions are detected, the system increases scanning activity to establish connections quickly. When no transmissions are present, scanning is reduced or suspended. This feedback mechanism maintains connection speed when necessary while minimizing power consumption during normal operation.
Data Source
AI summary
A method of controlling a low power radio receiver including controlling the radio receiver for a first, relatively short, period of time to detect radio transmissions in a predetermined frequency band, and determining whether to control the radio receiver for a subsequent second relatively longer period of time to receive data from a subsequent radio transmission in the predetermined frequency band.