5G Electronic Device Transmit Power Control for SAR Compliance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The 5G communication system faces challenges in meeting regulatory standards for human exposure to electromagnetic radiation, specifically SAR and MPE, due to its implementation in mmWave bands, which makes it difficult to reduce transmit power effectively.
Innovation Solution
An electronic device is designed with a dual processor architecture and Wi-Fi module that can adjust transmit power based on communication states, using a first processor for legacy networks and a second processor for 5G networks, allowing for dynamic power management to comply with regulatory limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmit power is reduced based on frequency band to meet SAR and MPE regulations, then electromagnetic radiation compliance is improved, but communication performance in mmWave band deteriorates
Solution Approach 1:
The patent implements dynamic transmit power control where the electronic device continuously monitors its communication state (4G/LTE or 5G/mmWave) and adjusts transmit power levels accordingly. The processor dynamically switches between different power control strategies: using frequency-band-based power reduction for sub-6GHz bands to meet SAR/MPE regulations, while maintaining higher power capabilities for mmWave bands when 5G communication is active, thus adapting to changing operational conditions
Solution Approach 2:
The patent changes the key parameter of transmit power based on the identified communication state. When 5G mmWave communication is detected, the device maintains higher transmit power to overcome path loss and achieve desired communication performance. When operating in 4G/LTE or sub-6GHz 5G modes, the device reduces transmit power to comply with SAR and MPE regulations. This parameter change resolves the contradiction by making transmit power a variable that adapts to the communication standard being used
2Productivity
If dual processor architecture is implemented to manage different communication modules, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the communication management function by implementing a dual-processor architecture where a first processor (application processor) handles 4G/LTE and Wi-Fi communications, while a second processor (communication processor) specifically handles 5G/mmWave communications. This segmentation allows each processor to be optimized for its specific communication standard, improving overall communication efficiency while distributing the computational burden
Solution Approach 2:
The first processor is designed with multi-functionality to handle both traditional 4G/LTE communication and Wi-Fi operations, while also being capable of detecting its own communication state and triggering appropriate power control actions for co-located modules. This universal capability reduces the need for completely separate control logic and allows shared resources between different communication standards
Data Source
AI summary
An electronic device includes a Wi-Fi module configured to perform communication in a first frequency band, a communication module configured to wirelessly communicate with a given network in a second frequency band, a first processor operatively connected to the communication module, a second processor operatively connected to the Wi-Fi module and the first processor, and a memory operatively connected to the second processor. The memory may store instructions, that when executed by the second processor, cause the second processor to receive, from the first processor, a message notifying a state of the electronic device wirelessly communicating with the given network and to lower transmit power of the Wi-Fi module in response to the message.