Indoor Positioning Control System for Power Optimization
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Solution Overview
Problem
Indoor positioning systems face challenges in reducing power consumption in mobile devices used as transmitters, which are typically smartphones, due to continuous communication with positioning servers to determine location.
Innovation Solution
A control system that includes a communications unit, an acquisition unit, and an output unit to adjust the time interval and transmission power of wireless signals based on the location of the transmitter, allowing for optimized power usage by varying the frequency and strength of signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transmitter continuously transmits wireless signals to enable accurate indoor positioning, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The transmitter alternates between transmission states and non-transmission states, performing periodic actions rather than continuous transmission. This reduces power consumption while maintaining positioning functionality by transmitting signals only when necessary.
Solution Approach 2:
The transmission parameters (time interval and power) are dynamically adjusted based on location information. The system transitions from static continuous transmission to dynamic adaptive transmission, optimizing the balance between positioning accuracy and power consumption.
2Reliability
If the transmitter increases transmission power to improve signal reliability, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The transmission power parameter is changed and adjusted based on location information. Instead of maintaining constant high power for reliability, the system adapts power levels dynamically, achieving necessary communication reliability while reducing overall power consumption.
3Use of energy by moving object
If the transmitter reduces transmission frequency to save power, then power consumption is reduced, but positioning accuracy deteriorates
Solution Approach 1:
The transmission time interval is dynamically adjusted based on location information rather than using a fixed reduced frequency. This allows the system to maintain positioning accuracy when needed while achieving power savings during periods when frequent transmission is not necessary.
Data Source
AI summary
A control system includes a communications unit, an acquisition unit, and an output unit. The communications unit communicates with a transmitter that transmits a wireless signal. The acquisition unit acquires location information about a location of the transmitter based on the wireless signal that has been transmitted from the transmitter and received by the communications unit. The output unit has an instruction signal including adjustment information transmitted, in accordance with the location information acquired by the acquisition unit, from the communications unit to the transmitter. The adjustment information is used to vary at least one of a time interval at which the transmitter transmits the wireless signal or transmission power with which the transmitter transmits the wireless signal.