Mobile Device Power Consumption Calculation Using State-Dependent Currents
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Solution Overview
Problem
Existing methods for calculating power consumption in mobile devices with mains-independent power supplies are complex and lack accuracy due to fluctuations in power usage, especially in systems with varying data rates and non-periodic behavior, making it difficult to determine the consumed charge Q over a period Δt.
Innovation Solution
A method that categorizes the mobile device's system states (receiving/transmitting, frequency-changing, inactive, and low-energy modes) to calculate power consumption using state-dependent typical currents, allowing for a relative accurate determination by considering significant power consumption components associated with each state, without the need for high-resolution current measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current measurement and integration of power variation with time is used to calculate power consumption, then measurement precision is improved, but device complexity increases due to requiring high-resolution analog/digital converters
Solution Approach 1:
The patent creates a simplified model (copy) of power consumption behavior by categorizing system states and assigning typical currents to each state. Instead of directly measuring and integrating actual power variations, the system uses pre-defined current values representing different operational states (transmitting, receiving, idle, frequency-changing), which are then combined based on state duration to calculate total charge consumption.
Solution Approach 2:
The patent transforms the continuous power consumption measurement problem into a discrete parameter-based calculation. By identifying key parameters (system states, state durations, typical currents per state) and changing from continuous measurement to discrete state-based calculation, the complexity of high-resolution analog/digital conversion is eliminated while maintaining acceptable measurement precision.
2Ease of operation
If packet-typical charge consumption is used to estimate actual power consumption in packet-oriented systems, then ease of operation is improved, but measurement precision deteriorates due to complex components and non-periodic behavior
Solution Approach 1:
The patent segments the power consumption calculation into distinct system states (transmitting, receiving, idle, frequency-changing) with characteristic current values for each segment. By dividing the operational spectrum into these discrete segments and calculating the contribution of each segment based on its duration and typical current, the method achieves both ease of operation and improved precision compared to treating all packet types uniformly.
Solution Approach 2:
The patent introduces dynamic adaptation by continuously monitoring system state transitions and adjusting the calculation in real-time. The system dynamically identifies current operational states, measures their durations, and selects appropriate typical currents from memory, allowing the calculation to adapt to varying operational conditions rather than relying on static packet-type classifications.
3Device complexity
If state-dependent typical currents are used to calculate power consumption, then device complexity is reduced, but measurement precision may worsen due to simplified modeling
Solution Approach 1:
The system uses its own internal state information (which state it is currently in and for how long) to calculate its power consumption. By leveraging the mobile device's inherent knowledge of its operational states and combining this with pre-stored typical current values, the system achieves self-measurement without external monitoring equipment, balancing simplicity and accuracy.
Data Source
AI summary
A method for calculating the power consumption of a mobile device, particularly of a mobile station of a mobile radio system, in an observation period Δt based on various possible system states sk in which the device can be in the period Δt. A value of a quantity Δk is determined system-state-dependently for the system states sk occurring in the period Δt. The power consumption in the period Δt is calculated in such a manner that the quantities Δk and state-dependent typical currents ik are taken into consideration.