Wireless Device Power Control via Remaining Energy Tracking
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Solution Overview
Problem
In wireless communication systems, controlling transmission power is challenging due to the need to balance quality of service (QoS) and specific absorption rate (SAR) limits, as increasing transmission power enhances user exposure to RF electromagnetic fields, potentially exceeding SAR limits and degrading QoS.
Innovation Solution
A method for controlling transmission power in wireless communication devices involves calculating remaining power levels based on tolerant and used power levels, adjusting transmission power levels accordingly, and generating power control signals to manage power levels effectively, ensuring both QoS and SAR compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to maintain quality of service, then QoS is improved, but SAR limits are exceeded and user safety is compromised
Solution Approach 1:
The patent implements dynamic transmission power control by continuously monitoring remaining power levels and adjusting transmission power in real-time based on accumulated energy emission. The system transitions from static power levels to dynamic adjustment, using remaining power level calculations to modulate transmission power and generate appropriate power control signals, thereby resolving the contradiction between maintaining QoS and limiting SAR exposure.
Solution Approach 2:
The system employs feedback mechanisms by calculating remaining power levels based on tolerant power levels and used energy from previous time periods. This feedback loop allows the system to adjust transmission power based on accumulated energy emission data, ensuring SAR compliance while maintaining adequate power for QoS. The feedback control generates power control signals that reflect the current energy emission status.
2Object-affected harmful factors
If transmission power is decreased to comply with SAR limits, then SAR compliance is improved, but quality of service deteriorates
Solution Approach 1:
The system dynamically adjusts transmission power based on remaining power level calculations rather than using fixed low power levels. By calculating remaining power levels from tolerant power levels and subtracting used energy, the system determines appropriate transmission power that complies with SAR limits while maintaining sufficient power for QoS when energy headroom is available.
Solution Approach 2:
The patent changes the parameter of transmission power based on calculated remaining power levels. The system modifies transmission power parameters dynamically by generating power control signals that reflect current energy emission status, allowing flexible adjustment between SAR compliance and QoS requirements based on real-time energy availability.
3Reliability
If transmission power is continuously adjusted to balance QoS and SAR, then both QoS and SAR compliance are maintained, but system complexity increases
Solution Approach 1:
The patent segments the power control process into distinct functional components: calculating remaining power levels based on tolerant power levels and used energy, determining appropriate transmission power levels, and generating power control signals. This segmentation of the power control function into manageable stages reduces overall system complexity while achieving the dual goals of QoS maintenance and SAR compliance.
Solution Approach 2:
The system performs self-service by autonomously calculating remaining power levels and generating appropriate power control signals without requiring external intervention. The power control mechanism serves itself by using its own energy emission data to make adjustment decisions, reducing the need for complex external control systems while maintaining QoS and SAR compliance.
Data Source
AI summary
A method of controlling transmission power used for wireless transmission in a wireless communication device including calculating a remaining power level of a third period based on a tolerant power level of a first period and a remaining power level of a second period, the third period included in the first period and being a period from a current time to a point in time following the current time, the second period being a period from the current time to a point in time preceding the current time, calculating a transmission power level of the third period based on a target power level and the remaining power level of the third period, and generating a power control signal for determining a power level of a transmission signal unit based on the transmission power level of the third period may be provided.