Communication Device RF Energy Emission Control
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Solution Overview
Problem
Communication devices emit excessive radio-frequency (RF) energy, potentially exceeding safety standards, and there is a need to reduce this emission to comply with stricter regulations and address user concerns about health effects.
Innovation Solution
Implementing a method in communication devices to dynamically adjust transmission power levels and schedules based on real-time RF energy emission tracking and user proximity, using a 'leaky bucket' algorithm to ensure time-averaged compliance with Specific Absorption Rate (SAR) standards, allowing for intermittent transmission and power reduction when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communication device transmits at high power levels to meet transmission demands, then transmission quality and reliability are improved, but RF energy emission increases and may exceed SAR standards
Solution Approach 1:
The patent implements dynamic power adjustment where the communication device continuously monitors cumulative RF energy emission and adapts transmission power levels in real-time. The power level changes from static to dynamic based on current emission status, allowing the device to transmit at high power when cumulative emission is low and reduce power when approaching SAR limits, thus resolving the contradiction between maintaining transmission quality and limiting RF energy emission.
Solution Approach 2:
The patent changes the parameter of transmission power from a fixed value to a variable that depends on cumulative RF energy emission. By introducing the parameter 'cumulative RF energy emission' as a control variable, the system dynamically adjusts power levels to stay within SAR standards while maximizing transmission effectiveness when possible, thereby resolving the contradiction between transmission reliability and harmful RF emission.
2Object-generated harmful factors
If the device reduces transmission power to comply with SAR standards, then RF energy emission is reduced, but transmission capacity and productivity decrease
Solution Approach 1:
The patent implements periodic transmission scheduling where the device alternates between transmission periods and idle periods based on cumulative RF energy emission thresholds. During transmission periods, the device transmits at appropriate power levels; during idle periods, cumulative emission decreases, allowing future transmission opportunities. This periodic action pattern maintains SAR compliance while maximizing overall transmission capacity within available time windows.
Solution Approach 2:
The system dynamically adjusts transmission scheduling and power levels based on real-time cumulative emission status. When cumulative emission is low, the device can transmit more frequently and at higher powers; when approaching limits, it reduces transmission activity. This dynamic adaptation resolves the contradiction by optimizing transmission capacity within the constraints of SAR compliance rather than using a fixed reduced power level.
3Object-generated harmful factors
If the device continuously monitors and adjusts transmission power, then SAR compliance is ensured, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the device monitors its own cumulative RF energy emission and uses this information to adjust future transmission power levels. The feedback loop tracks emitted energy and compares it against SAR thresholds, automatically adjusting power accordingly. This self-regulating feedback system ensures SAR compliance without requiring complex external control systems, resolving the contradiction between compliance assurance and device complexity.
Solution Approach 2:
The communication device performs self-monitoring and self-adjustment of transmission power based on its own emission patterns. Rather than requiring external monitoring equipment or complex network-controlled power management, the device autonomously tracks cumulative RF energy and regulates its own transmissions to comply with SAR standards, thereby ensuring compliance while minimizing additional complexity.
Data Source
AI summary
Aspects of the present disclosure teach decreasing, in a time-averaged regime, the amount of RF energy emitted by a communications device. Generally speaking, the network tells the communications device what power level it should transmit at. If, however, the device determines that it would exceed an emission standard by transmitting at the specified power level for as long as it needs to in order to carry out its transmission duties, then the device can instead decide to transmit at a lower power level. Alternatively (or in combination), the device can, instead of transmitting all the time while it has data to send, only transmit intermittently. In either case, the emitted electromagnetic energy, as averaged over a period of time, is reduced below the maximum allowed by the standard. Later, if possible and necessary, the device can again transmit at a higher power level or more frequently.