Adjustable Cell Size Transceivers for Bluetooth Wi-Fi Interference
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Solution Overview
Problem
The coexistence of Bluetooth and Wi-Fi signals in the 2G spectrum leads to interference, degrading the performance of both transceiver systems, and existing solutions like Time Division Multiplexing or increased board isolation either reduce performance or increase costs.
Innovation Solution
A controller is used to adjust the cell size of WLAN and Bluetooth transceivers to minimize interference, allowing for optimized cell size adjustments by reducing transmit power, transmission rates, or duty cycles, enabling parallel operation while protecting Bluetooth transceivers from WLAN interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Time Division Multiplexing is used to avoid interference between Bluetooth and Wi-Fi signals, then interference is reduced, but performance is reduced
Solution Approach 1:
The patent adjusts the cell size parameter of the WLAN transceiver to dynamically control the spatial extent of WLAN transmissions. By reducing the cell size during Bluetooth transmissions, the patent minimizes interference while allowing full WLAN performance during Bluetooth reception periods, thus resolving the contradiction between interference reduction and performance maintenance
2Object-affected harmful factors
If board isolation between Bluetooth and Wi-Fi antennas is increased to avoid interference, then interference is reduced, but cost increases
Solution Approach 1:
Instead of increasing physical board isolation which raises manufacturing costs, the patent changes the operational parameter (cell size) of the WLAN transceiver. This software-controlled parameter adjustment achieves interference reduction without any additional hardware cost, directly resolving the contradiction between interference mitigation and manufacturing cost
3Object-affected harmful factors
If cell size of WLAN transceiver is reduced to protect Bluetooth transceiver, then interference is reduced, but WLAN throughput is reduced
Solution Approach 1:
The patent implements periodic adjustment of the WLAN cell size based on Bluetooth transmission activity. During Bluetooth transmission periods, the cell size is reduced to protect Bluetooth signals. During Bluetooth reception periods, the cell size is restored to maximum to optimize WLAN throughput. This periodic action resolves the contradiction by achieving interference protection only when necessary while maximizing WLAN performance when possible
Data Source
AI summary
One example of a device includes a Bluetooth transceiver, a Wireless Local Area Network (WLAN) transceiver, and a controller. The WLAN transceiver is proximate the Bluetooth transceiver. The controller is communicatively coupled to the Bluetooth transceiver and the WLAN transceiver. The controller is configured to adjust a cell size of the WLAN transceiver or the Bluetooth transceiver to reduce interference between WLAN transceiver traffic and Bluetooth transceiver traffic.