Simultaneous Dual-Radio Power Allocation Within RF Limits
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Solution Overview
Problem
Current wireless communication devices face challenges in maintaining simultaneous primary and secondary radio frequency link transmissions within radio frequency exposure limits, leading to potential call drops and communication slowdowns due to restrictions on instantaneous power.
Innovation Solution
A method is introduced to determine an unused power margin between the current time-averaged transmit power of a primary radio and the transmit power limit, and then allocate a portion of this margin to a secondary radio. This allocation includes a secondary reserve transmit power, which is less than the transmit power limit, to restrict the average transmit power of both radios within defined reserves and margins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high power transmissions are used to maintain communication quality, then communication productivity is improved, but radio frequency exposure limits are violated
Solution Approach 1:
The patent implements dynamic transmit power management where the device continuously monitors SAR values and adjusts transmit power in real-time. The power manager modifies power levels based on current transmission conditions, user position, and RF exposure metrics, allowing the system to optimize communication quality while maintaining compliance with safety limits through adaptive rather than static power control
Solution Approach 2:
The system changes the transmit power parameter dynamically based on measured SAR values and exposure conditions. By monitoring RF exposure metrics and adjusting power levels accordingly, the device can operate at high power when safe and reduce power when approaching limits, thus resolving the contradiction between productivity and safety compliance
2Object-affected harmful factors
If transmit power is restricted to comply with SAR limits, then radio frequency exposure is controlled, but communication reliability deteriorates
Solution Approach 1:
The patent performs preliminary SAR measurements and power margin calculations before initiating high-power transmissions. The system pre-calculates available power margins based on current SAR values and predicts whether high-power transmission can be safely executed, allowing the device to maintain communication reliability by planning power usage in advance rather than reacting after limits are approached
Solution Approach 2:
The system implements continuous feedback loops where SAR measurements are monitored and fed back to the power manager. This feedback mechanism allows real-time adjustment of transmit power to maintain both safety compliance and communication quality, ensuring reliability by continuously adapting to changing RF exposure conditions
3Object-affected harmful factors
If instantaneous power is restricted to maintain average power within limits, then radio frequency exposure is controlled, but communication speed decreases
Solution Approach 1:
The patent segments the time window into discrete intervals and manages power margins separately for each interval. By dividing the time window and tracking power margins per interval, the system can allow high instantaneous power in certain intervals when power margins permit, while ensuring average power compliance overall. This segmentation enables faster communication speeds by utilizing available power capacity more effectively rather than uniformly limiting power throughout
Solution Approach 2:
The system allows partial high-power transmissions when power margins are available, rather than completely restricting power. By permitting excessive instantaneous power in specific time intervals when safe, the system can compensate with lower power in other intervals, maintaining average compliance while achieving higher overall communication speed through partial high-power operation
4Reliability
If power margins are reserved to prevent call drops, then communication reliability is improved, but available transmit power is reduced
Solution Approach 1:
The patent implements dynamic power margin management where reserved power margins are not fixed but continuously adjusted based on actual transmission conditions. The system dynamically allocates power margins between reliability reserves and available transmit power, allowing maximum power usage when conditions permit while maintaining reliability through adaptive rather than static reservation
Solution Approach 2:
The system changes power margin parameters in real-time based on SAR measurements, transmission quality, and network conditions. By dynamically adjusting power margin allocations, the system can reduce reserved margins when transmission quality is poor or RF exposure is low, thereby increasing available transmit power while maintaining reliability through condition-based parameter changes
Data Source
AI summary
Simultaneous primary and secondary radio frequency link transmissions are described. The transmissions are restricted to within radio frequency exposure limits. A method is described that includes determining an unused power margin between an average transmit power of a primary radio and the transmit power limit. A combination of a portion of the unused power margin and a secondary reserve transmit power are allocated to the secondary radio. The average transmit power of the secondary radio is restricted to within the combination.