Dynamic Transmit Power Control for Bluetooth Low Energy
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Solution Overview
Problem
Wireless communication protocols like Bluetooth Low Energy (BTLE) face limitations due to power constraints in portable devices, leading to degraded performance and increased retries, which affect user experience and power consumption.
Innovation Solution
An electronic device dynamically adjusts its transmit power level based on performance metrics, such as bit error rate and received signal strength, switching from a low-power to a high-power state to improve communication quality, while monitoring battery power levels and trigger events to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the device transmits advertising packets using low power to conserve battery, then power consumption is reduced, but communication performance degrades and retry rates increase
Solution Approach 1:
The patent implements dynamic transmit power adjustment by transitioning between low-power and high-power states based on communication conditions. The interface circuit monitors communication quality metrics (such as packet error rate or signal strength) and adaptively selects transmit power levels, allowing the system to optimize between power consumption and communication reliability in real-time rather than using a fixed power level
Solution Approach 2:
The patent changes the transmit power parameter dynamically based on communication performance feedback. By monitoring communication quality indicators and adjusting the transmit power level accordingly (increasing power when communication quality degrades, decreasing when it improves), the system optimizes the balance between power consumption and communication reliability through parameter adaptation
2Reliability
If the device uses high transmit power to improve communication quality, then communication performance improves, but power consumption increases
Solution Approach 1:
The system dynamically adjusts transmit power based on monitored communication conditions. When communication quality metrics indicate poor performance (high error rates, weak signal), the device transitions to high-power state to improve reliability. When conditions are good, it switches to low-power state, creating a dynamic response that optimizes both communication quality and power consumption based on real-time conditions
Solution Approach 2:
The interface circuit monitors communication quality feedback (such as packet error rates, signal strength indicators, or acknowledgment responses) and uses this information to adjust transmit power levels. This feedback mechanism allows the system to increase power only when communication quality deteriorates, rather than continuously operating at high power, thus improving communication reliability while minimizing unnecessary power consumption
3Reliability
If the device increases transmit power to reduce retries, then communication reliability improves, but net power consumption increases
Solution Approach 1:
The patent implements dynamic power state transitions based on communication success rates and error conditions. By monitoring whether transmissions require retries and adjusting power levels accordingly, the system optimizes the balance between achieving reliable communication and minimizing total energy consumption, rather than using a static high-power approach that would consume excessive energy
Data Source
AI summary
In order to improve communication with another electronic device, during an advertising mode an electronic device (such as a smartphone) may transmit a packet with advertising information using a default transmit power level. Then, based on feedback about a performance metric associated with the communication from the other electronic device, the electronic device may selectively increase the transmit power level for a subsequent packet. Because this selective increase in the transmit power level may increase the overall power consumption, the change in the transmit power level also may depend on one or more factors, such as a battery power level of the electronic device. However, the selective increase in the transmit power level may, in some instances, decrease the overall power consumption by reducing or eliminating retries.