WWAN Interference Mitigation via WLAN Identifier Detection
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Solution Overview
Problem
Existing radio communication technologies face interference issues when devices operating on different air interfaces and nearby frequency bands are in close proximity, despite compliance with regulations, due to out-of-band emissions, which previous solutions have not adequately addressed for devices that cannot directly detect each other.
Innovation Solution
A method and apparatus that involve a portable communication device receiving a WLAN access point identifier to determine if interference mitigation is needed, configuring the WWAN transceiver to avoid specific frequency bands, thereby preventing interference between devices operating on different WWAN air interfaces by using interference mitigation functionality implemented in software or hardware components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If devices operate on different WWAN air interfaces and nearby frequency bands, then spectrum utilization is improved, but out-of-band emissions cause interference between devices
Solution Approach 1:
The system performs preliminary detection of nearby devices operating on different air interfaces before interference occurs. By detecting the presence of other devices and predicting potential interference scenarios in advance, the system can proactively adjust frequency usage or transmission parameters to prevent out-of-band emissions from causing harmful interference, thus resolving the contradiction between spectrum utilization and interference prevention
Solution Approach 2:
The system implements a feedback mechanism where devices continuously monitor the radio frequency environment, detect out-of-band emissions from nearby devices, and adjust their transmission parameters accordingly. This closed-loop feedback allows devices to maintain high spectrum utilization while dynamically reducing interference through real-time parameter adjustment based on detected emission levels
2Ease of operation
If devices are placed in close proximity to maximize portability and convenience, then ease of operation is improved, but co-location interference between transceivers increases
Solution Approach 1:
The system applies local quality by implementing interference mitigation specifically at the co-located device level rather than system-wide restrictions. Each device independently detects and responds to interference from nearby devices, allowing portable devices to remain in close proximity for convenience while locally adjusting transmission parameters to minimize out-of-band emissions and prevent harmful interference between transceivers
3Object-affected harmful factors
If frequency bands are separated to eliminate interference, then interference between devices is reduced, but spectrum efficiency deteriorates
Solution Approach 1:
The system employs dynamic frequency management where devices can operate on nearby frequency bands when interference conditions permit, and dynamically adjust or separate frequency usage when interference is detected. This dynamic approach allows the system to maintain high spectrum efficiency by utilizing nearby bands most of the time, while temporarily separating frequencies only when necessary to prevent interference, thus resolving the contradiction between interference reduction and spectrum efficiency
Data Source
AI summary
A portable communication device operating of a first WWAN can receive an identifier from a WLAN access point indicating that one or more devices operating on a second WWAN are in the vicinity of the WLAN access point. In response, the portable communication device invokes an interference mitigation process while the identifier indicates that devices operating on the second WWAN are present.