Co-located WLAN and Bluetooth Flow Control
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Solution Overview
Problem
Bluetooth (BT) and wireless local area network (WLAN) devices experience significant interference when co-localized, leading to desensitization of BT receivers and ineffective hardware shutdown solutions, resulting in reduced PHY rates and increased collision probabilities.
Innovation Solution
Implementing flow control techniques that derive available medium time for WLAN devices to communicate with peers based on schedule data from BT devices, using methods such as transmitting null frames or spoofed PLCP preambles to manage data flow and mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hardware shutdown is implemented to protect BT reception, then BT receiver desensitization is reduced, but WLAN acknowledgment transmission is blocked causing PHY rate decrease and longer frame duration
Solution Approach 1:
The patent implements dynamic flow control that continuously monitors BT activity state and adjusts WLAN transmission behavior accordingly. When BT becomes inactive, WLAN is allowed to transmit; when BT is active, WLAN transmission is suspended. This dynamic adaptation resolves the contradiction by optimizing both BT reception quality and WLAN transmission efficiency based on real-time conditions rather than using static hardware shutdown.
Solution Approach 2:
The patent uses feedback from BT activity monitoring to control WLAN transmission. The system receives BT activity indicators and uses this feedback to decide whether to allow WLAN data transmission or suspend it. This feedback mechanism ensures that WLAN transmissions do not occur during BT active periods, preventing receiver desensitization while maximizing WLAN throughput during BT inactive periods.
2Adaptability or versatility
If BT device determines frequency bands for hopping, then AFH works effectively, but strong WLAN transmission signal desensitizes BT receiver making frequency band determination impossible
Solution Approach 1:
The patent implements preliminary flow control by checking BT activity state before allowing WLAN transmission. By proactively preventing WLAN transmissions during BT active periods, the system ensures that BT receiver desensitization does not occur, thereby maintaining the BT device's ability to accurately determine frequency bands for hopping. This preliminary prevention resolves the contradiction by ensuring measurement precision is maintained.
3Productivity
If WLAN transmits acknowledgment during BT reception, then WLAN communication continues, but BT receiver becomes blinded or saturated due to WLAN transmission
Solution Approach 1:
The patent introduces an intermediary flow control mechanism that mediates between WLAN transmission needs and BT reception requirements. This intermediary layer monitors BT activity state and controls WLAN transmission accordingly, allowing WLAN to transmit only when BT is inactive. This mediation resolves the contradiction by preventing BT receiver blinding while maintaining WLAN communication continuity through timely transmission during BT inactive periods.
Data Source
AI summary
Flow control techniques for co-localized wireless local area network (WLAN) and Bluetooth (BT) allowing efficient sharing of radio medium are disclosed. In one embodiment, a method includes deriving an available medium time (TAV) for the WLAN device to communicate with a peer WLAN device based on schedule data forwarded by the BT device, transmitting a first data from the WLAN device to the peer WLAN device if the BT device becomes inactive and if the TAV is greater than a threshold time, and transmitting a second data from the WLAN device to the peer WLAN device if the TAV is less than the threshold time. The first data indicates that the WLAN device is to come out of a power save (PS) mode and the second data indicates that the WLAN device is to enter the PS mode.