Antenna Power and Cooling Control for 5G Skin Temperature Limits
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Solution Overview
Problem
Existing thermal control methods for mobile computing devices struggle to maintain skin temperature at or below user comfort levels during continuous or burst data transmissions in 5G wireless communication, leading to potential performance degradation of antennas and radios.
Innovation Solution
An integrated antenna power and cooling management system that delays default thermal control mechanisms, such as throttling of power to the antenna, until the estimated heat output by the antenna meets a preset percentage of the total heat capacity of surrounding components, thereby allowing extended periods for continuous or burst data transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal control mechanisms throttle power to the antenna to maintain skin temperature, then user comfort is improved, but data transmission performance deteriorates
Solution Approach 1:
The system performs preliminary thermal energy estimation before throttling occurs. The controller estimates the thermal energy that will be output during the transmission, allowing it to predict whether throttling will be necessary and to make informed decisions about power management before the actual thermal issue arises.
Solution Approach 2:
The system uses the heat capacity of surrounding components (chassis, heat sinks, cooling structures) as a thermal buffer to absorb antenna heat during transmissions. These surrounding components effectively serve the antenna by providing passive thermal management, delaying the need for active throttling and extending the duration of high-performance transmissions.
2Temperature
If thermal control mechanisms throttle power to the antenna, then user comfort is improved, but transmission duration is reduced
Solution Approach 1:
The controller estimates thermal energy output before transmission begins, allowing it to determine in advance whether the surrounding components have sufficient heat capacity to absorb the heat. This preliminary assessment enables the system to commit to longer transmission durations without risking thermal discomfort to the user.
Solution Approach 2:
The surrounding components (chassis, heat sinks, cooling structures) act as intermediary thermal buffers between the antenna and the user's skin. These intermediaries absorb the thermal energy during transmission, protecting the user from direct heat exposure while allowing the antenna to operate at full power for extended periods.
3Productivity
If the system allows extended data transmissions, then productivity is improved, but thermal energy output increases
Solution Approach 1:
The surrounding components serve as intermediary thermal storage, absorbing the increased thermal energy output during extended transmissions. This intermediary buffer allows the system to maintain high productivity for longer periods without proportionally increasing the thermal burden on the user, as the intermediaries temporarily store the excess thermal energy.
Solution Approach 2:
The system changes the thermal management parameter from direct cooling to thermal buffering. Instead of immediately dissipating heat through active cooling or throttling, the system utilizes the heat capacity parameter of surrounding components to absorb and temporarily store thermal energy, effectively decoupling transmission duration from immediate thermal impact on the user.
Data Source
AI summary
An information handling system executing an integrated antenna power and cooling management system may comprise an antenna situated nearby components of the information handling system, a chassis enclosing the information handling system, the antenna, and a wireless interface device with a wireless radio to generate a signal to transmit data via the antenna, where the components and the chassis are capable of absorbing a total thermal heat capacity, the chassis having an outer surface coming into contact with human skin during execution of the information handling system, a temperature sensor to determine an operating temperature of the information handling system reaching a control point value, and a processor executing code instructions to estimate antenna thermal output during data transmission relative to the total thermal heat capacity of the components, based on the operating temperature of the information handling system, and control an active cooling system for cooling the chassis.