Co-existence Manager Suppresses Wi-Fi Scanning During Voice Calls
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Solution Overview
Problem
Interference between Bluetooth (BT) and Wi-Fi signals, particularly during Synchronous Connection Oriented (SCO) calls, degrades the Mean Opinion Score (MOS) of voice calls due to concurrent transmission and reception at similar frequencies, which existing adaptive frequency hopping techniques fail to adequately mitigate when both transceivers are integrated in a device.
Innovation Solution
Implementing a co-existence manager in wireless stations to selectively suppress background scanning operations based on whether the voice call is facilitated using cellular or Wi-Fi protocols, allowing scanning during cellular calls but preventing it during Wi-Fi calls to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If background scanning operations are performed during Wi-Fi calls, then network discovery and connectivity options are maintained, but interference between Wi-Fi and Bluetooth signals increases degrading voice call quality
Solution Approach 1:
The system dynamically adjusts scanning behavior based on the active call type. During Wi-Fi calls, scanning is suppressed to prevent interference with Bluetooth voice quality. During cellular calls, scanning is allowed to maintain network discovery capability. This dynamic adaptation resolves the contradiction by making the scanning behavior context-dependent rather than static.
Solution Approach 2:
The system changes the operational parameter of scanning from active to suppressed based on the call type. By detecting whether a Wi-Fi or cellular call is active, the system modifies the scanning parameter accordingly, allowing scanning only when it won't interfere with Bluetooth voice quality.
2Object-affected harmful factors
If background scanning operations are suppressed during Wi-Fi calls, then Bluetooth signal interference is reduced improving voice quality, but network discovery and connectivity options are limited
Solution Approach 1:
The system dynamically restores scanning capability when cellular calls are detected. The suppression of scanning is not permanent but conditional - it is lifted when the call type changes from Wi-Fi to cellular, thereby restoring network discovery capability when needed while maintaining interference prevention during Wi-Fi calls.
Solution Approach 2:
The system continuously monitors the call type and uses this feedback to adjust scanning behavior. When cellular calls are detected, the system receives feedback that scanning should be permitted, thereby restoring network discovery capability. This feedback mechanism ensures that scanning is suppressed only when necessary to prevent interference.
3Object-affected harmful factors
If adaptive frequency hopping is used for Bluetooth communications, then frequency interference is reduced, but interference during integrated transceiver operations remains inadequate
Solution Approach 1:
The system segments the operation modes into distinct Wi-Fi call mode and cellular call mode, applying different scanning behaviors to each. This segmentation allows targeted interference prevention during Wi-Fi calls while maintaining network discovery during cellular calls, resolving the inadequacy of frequency hopping alone.
Solution Approach 2:
The co-existence manager acts as an intermediary that coordinates between Wi-Fi and Bluetooth operations. It detects call types and mediates scanning behavior accordingly, providing additional interference prevention beyond what adaptive frequency hopping can achieve alone.
Data Source
AI summary
In a wireless network, a method for operating a wireless device including at least a cellular modem, a wireless local area network (WLAN) controller, and a Bluetooth (BT) controller, the method comprising facilitating a voice call with another device; generating a signal, from the cellular modem, indicating whether the cellular modem is active during the voice call; and selectively suppressing background scanning operations based, at least in part, on the signal.