Wi-Fi Power Back-Off Based on Cellular Antenna Proximity
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Solution Overview
Problem
Existing electronic devices face challenges in managing electromagnetic radiation exposure, particularly in scenarios where both cellular data and Wi-Fi communication are active, as they need to comply with specific absorption rate (SAR) regulations, and determining appropriate back-off strategies for transmission power based on antenna distances is lacking.
Innovation Solution
The electronic device determines whether to perform back-off operations on Wi-Fi transmission power based on the distance between cellular data and Wi-Fi antennas, ensuring compliance with SAR regulations by adjusting transmission power levels accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If back-off operation is performed on Wi-Fi transmission power to ensure SAR compliance, then electromagnetic radiation exposure is reduced, but transmission power and communication performance deteriorate
Solution Approach 1:
The patent applies local quality by performing back-off operation selectively on specific Wi-Fi antennas based on their individual distances to cellular antennas. Instead of uniformly reducing power across all Wi-Fi antennas, the system identifies antennas with short distances to cellular antennas and applies back-off only to those, while maintaining full power for antennas with sufficient separation. This localized approach ensures SAR compliance for problematic antenna combinations while preserving transmission power and communication performance for other antennas.
2Device complexity
If back-off operation is performed without considering antenna distance, then SAR compliance is simplified, but unnecessary power reduction occurs
Solution Approach 1:
The patent applies preliminary action by pre-storing distance information between Wi-Fi antennas and cellular antennas before back-off operation is needed. The system calculates and stores these distances in advance, so when SAR compliance management is required, the device can immediately retrieve the stored distance information and make informed decisions about which antennas need back-off. This eliminates the need for complex real-time distance calculations during SAR compliance checks, simplifying the management process while avoiding unnecessary power reduction.
3Measurement precision
If distance information is stored for all antenna combinations, then back-off decision accuracy is improved, but memory requirements and device complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the antenna system into distinct groups: Wi-Fi antennas and cellular antennas. Instead of storing distance information for all possible antenna combinations in the device, the system segments the distance measurement task by having the processor calculate distances between each Wi-Fi antenna and each cellular antenna on-demand or periodically, then store only the relevant distance values needed for back-off decisions. This segmented approach maintains measurement precision for back-off accuracy while reducing the quantity of stored information compared to storing all possible combinations.
Data Source
AI summary
According to various embodiments, an electronic device may comprise: an RF circuit configured for cellular data communication, a plurality of antennas connected to the RF circuit, a Wi-Fi module comprising Wi-Fi circuitry, and at least one processor. The at least one processor may be configured to provide a first indication indicating activation of cellular data communication based on a first antenna among the plurality of antennas being used for transmission. A distance between the first antenna and a Wi-Fi antenna corresponding to the Wi-Fi module may be equal to or less than a first value. The Wi-Fi module may be configured to perform a back-off operation on transmission power of a Wi-Fi RF signal based on reception of the first indication. The at least one processor may be further configured to refrain from providing the first indication, based on a second antenna from which distance to the Wi-Fi antenna exceeds the first value among the plurality of antennas being used for transmission.