Wireless Transmitter Power Budget Sharing for RF Exposure Compliance
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Solution Overview
Problem
Current wireless communication devices face challenges in managing radio frequency exposure and power allocation across multiple transmitters, particularly in scenarios involving simultaneous and overlapping transmissions with different networks, where existing methods do not adequately account for varying exposure impacts and may lead to unnecessary power reduction or non-compliance with regulatory limits.
Innovation Solution
A method for dynamically sharing a total power budget between transmitters in a wireless communication device, where a fixed ratio is determined based on individual transmitter exposure limits, and power is allocated accordingly to ensure compliance with radio frequency exposure standards while optimizing uplink performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmitters operate simultaneously to increase data throughput, then network performance and data capacity are improved, but radio frequency exposure to the user increases and may exceed regulatory limits
Solution Approach 1:
The patent implements dynamic power sharing where the controller continuously monitors power requests from multiple networks and adjusts the power allocation ratio between transmitters in real-time. This dynamic adjustment allows the system to maintain high data throughput when possible while automatically reducing power when regulatory limits are approached, resolving the contradiction between productivity and harmful factors.
Solution Approach 2:
The system changes the power allocation parameter dynamically based on the sum of power requests. When the total requested power exceeds a threshold, the controller modifies the power sharing ratio between transmitters, thereby controlling the actual transmitted power to comply with regulatory limits while attempting to maintain network performance.
2Reliability
If power is reduced to comply with radio frequency exposure limits, then regulatory compliance is improved, but network performance and uplink capacity deteriorate
Solution Approach 1:
The controller dynamically adjusts power levels based on real-time conditions. When power reduction is necessary for compliance, the system does so selectively and proportionally across transmitters rather than uniformly, maintaining the best possible network performance while meeting regulatory requirements. The dynamic nature allows for recovery of performance when conditions permit.
Solution Approach 2:
The system applies partial power reduction only when necessary to meet regulatory limits, rather than consistently reducing power to a fixed low level. The power sharing ratio is adjusted partially from the ideal allocation to achieve compliance, preserving maximum possible network performance while ensuring regulatory compliance is met.
3Ease of operation
If fixed power allocation is used between transmitters, then power management is simplified, but the system cannot adapt to varying network conditions and exposure impacts
Solution Approach 1:
The patent implements a dynamic power sharing mechanism where the controller continuously monitors power requests from multiple networks and adjusts the power allocation ratio between transmitters in real-time. This dynamic approach maintains simplicity in the power management architecture while significantly improving adaptability to varying network conditions and exposure impacts.
4Ease of operation
If equal power sharing is used between transmitters, then power distribution is uniform and simple, but it does not account for varying exposure impacts of different transmitters
Solution Approach 1:
The patent applies different power sharing ratios to different transmitters based on their individual exposure characteristics. Instead of uniform power distribution, the system assigns quality-differentiated power allocation where each transmitter receives power proportional to its exposure impact, thereby maintaining compliance reliability while preserving reasonable operational simplicity.
Data Source
AI summary
The present application provides a method and a wireless communication device, which includes selecting a total transmitter power target. A target transmitter power is identified for each of the transmitters operating separately at which each individual transmitter would meet a transmitted radio frequency signal exposure limit relative to a user of the wireless communication device. A fixed ratio is determined for each of the transmitters to be used with the total transmitter power target, based on the determined fixed ratio of the target transmitter power identified for each of the transmitters to the total transmitter power target. Power is dynamically shared between the transmitters in response to varying uplink power requests received from a network, where a power level being used for each of the transmitters is equal to the determined fixed ratio multiplied by a corresponding one of a shared power value, where the sum of the shared power values equals the total transmitter power target for each of the transmitters.