Dynamic RF Exposure Budgeting for Multi-Radio Control Signaling
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Solution Overview
Problem
Electronic devices with wireless capabilities face challenges in meeting regulatory limits on radio-frequency exposure without sacrificing performance, as static RFE budget distribution leads to sub-optimal power usage and potential exceedance of regulatory limits.
Innovation Solution
Implementing an RF exposure metric manager that dynamically allocates RFE budgets based on application data classification, prediction, and control signaling, ensuring compliance with regulatory limits while optimizing wireless performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a static RFE budget distribution is used across radios, then the device meets regulatory limits, but wireless performance is sacrificed and transmit power backoffs occur
Solution Approach 1:
The patent implements dynamic RFE budget allocation that adjusts the RFE budget for control signaling based on device motion state. When the device is stationary, a first (smaller) amount of RFE budget is allocated to control signaling. When the device is in motion, a second (larger) amount of RFE budget is allocated to control signaling. This dynamic adjustment allows the system to optimize wireless performance while ensuring regulatory compliance under different operating conditions.
2Productivity
If RFE budget is increased to maximize transmit power, then wireless performance improves, but regulatory limits on radio-frequency exposure may be exceeded
Solution Approach 1:
The patent changes the parameter of RFE budget allocation based on device motion state. By detecting whether the device is stationary or in motion, the system adjusts the RFE budget parameters dynamically. This allows transmit power to be optimized for each condition without exceeding regulatory limits, as the RFE budget is appropriately sized for the actual transmission needs under different motion states.
3Reliability
If control signaling RFE budget is increased for mobile devices, then control data transmission is ensured, but overall RFE budget consumption increases
Solution Approach 1:
The patent applies local quality by allocating RFE budget specifically for control signaling based on device motion state, rather than uniformly across all transmissions. When the device is in motion, additional RFE budget is locally allocated to control signaling to ensure reliable control data transmission. When stationary, this local allocation is reduced. This targeted approach ensures control signaling reliability when needed while minimizing unnecessary RFE budget consumption.
Data Source
AI summary
An electronic device may include radios that transmit signals using antennas. Control circuitry may assign radio-frequency exposure (RFE) budgets to the radios. The control circuitry may classify and predict attributes of application data for transmission over the radios, may generate a per-radio data prediction based on the classified attributes, and may generate the RFE budgets based on the classified attributes. Each radio may transmit application data based on its data prediction and according to its RFE budget. A dynamic portion of the RFE budget may be reserved for control signaling. RFE planning in this way may ensure that the device optimally utilizes its RFE budget, increasing overall RFE during some time periods so sufficient transmit power is available, and ensuring that RFE is distributed across the radios depending on the amount and criticality of the data to be transmitted by each radio.