Wireless Transmit Power Adjustment for Energy Reduction
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Solution Overview
Problem
Current wireless communication methods, such as Bluetooth Low Energy (BLE), face high power consumption during device discovery and connection establishment, which is not optimized for reducing energy usage.
Innovation Solution
A broadcasting method and device that adjusts transmit power by decreasing it when a request is detected and increasing it if no request is received, determining a reference working power that minimizes power consumption while ensuring communication, and a scan method that adjusts transmit power based on signal strength changes to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless device uses high transmit power during broadcasting and scanning, then the communication reliability is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic transmit power adjustment during the broadcasting and scanning process. The device starts with high power to ensure reliable discovery, then progressively reduces power based on whether requests are received. This dynamic adaptation allows the system to maintain communication reliability when needed while minimizing power consumption during normal operation.
Solution Approach 2:
The patent changes the transmit power parameter from a fixed high value to a variable value that adjusts based on communication conditions. By monitoring request reception and signal strength, the system modifies the power parameter to find the minimum required level, thereby resolving the contradiction between reliability and power consumption.
2Stability of the object's composition
If a wireless device maintains high transmit power to ensure discovery and connection, then the communication stability is improved, but the battery life decreases
Solution Approach 1:
The patent performs preliminary high-power broadcasting to ensure stable device discovery and connection establishment. Once connection is achieved, the system transitions to lower power modes, thereby maintaining communication stability during critical phases while extending battery life during sustained operation.
Solution Approach 2:
The patent implements periodic broadcasting events with interval periods between them. During these periodic events, the device uses high power to maintain discovery capability, while between events it reduces power consumption. This periodic approach balances communication stability with battery life extension.
3Area of stationary object
If a wireless device uses maximum power for broadcasting packets, then the scanning range is improved, but the energy expenditure increases
Solution Approach 1:
The patent uses maximum power only partially - specifically during initial broadcasting events to establish scanning range. After receiving requests or determining the adequate range, the device reduces power to partial levels that maintain necessary coverage while significantly reducing energy expenditure. This partial use of maximum power resolves the contradiction between range and energy loss.
Solution Approach 2:
The patent employs feedback mechanisms where the device monitors received requests and signal strengths from scanning devices. Based on this feedback, the broadcasting device adjusts its transmit power level, reducing it when full power is no longer needed to maintain scanning range, thereby minimizing energy expenditure while preserving adequate coverage.
Data Source
AI summary
Resulting in a reduction of communication power consumption, a broadcasting method can comprise sending a broadcasting packet by using a current power and listening; when a request is detected by means of listening, recording the current power as a historical power, and decreasing the current power; and determining whether a current broadcasting event is ended, if the current broadcasting event is ended, determining the historical power as a reference working power, and otherwise, returning to the broadcasting and listening. A scan method can comprise: performing scan and listening; when a broadcasting packet is detected by means of listening, if a request has been sent to a sender of the broadcasting packet and a received signal strength of the broadcasting packet changes, adjusting a first transmit power; and sending the request to the sender of the broadcasting packet according to the adjusted first transmit power.