Dual-Antenna Wireless Coexistence Controller for WLAN and Bluetooth
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Solution Overview
Problem
The coexistence of WLAN and Bluetooth signals in the same unlicensed 2.4 GHz band poses challenges for integrated circuits, leading to frequent collisions and reduced WLAN performance due to the unknown Bluetooth schedule, requiring additional complexity and cost for prevention.
Innovation Solution
Implementing dual-technology wireless coexistence using spatial coexistence, where WLAN and Bluetooth signals utilize different antennas, and employing a coexistence mode controller to switch between spatial and temporal coexistence modes based on traffic levels and signal strength, allowing simultaneous operation or separate antenna use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If temporal coexistence is used to share antenna between WLAN and Bluetooth, then device complexity is reduced, but WLAN performance deteriorates due to frequent collisions
Solution Approach 1:
The patent divides the antenna system into separate dedicated antennas for WLAN and Bluetooth transceivers. This segmentation allows each transceiver to have its own dedicated antenna, eliminating collisions and interference that occur in temporal coexistence schemes where a single antenna is shared between technologies.
2Reliability
If additional protection mechanisms are added to prevent rate spirals in temporal coexistence, then WLAN reliability improves, but device complexity increases
Solution Approach 1:
The patent extracts the protection mechanism entirely by using dedicated antennas for each transceiver. Since each antenna is dedicated to a specific transceiver, there are no rate spirals or collisions to protect against, eliminating the need for complex protection logic in the switch controller.
3Reliability
If spatial coexistence with dedicated antennas is implemented, then WLAN performance improves by avoiding collisions, but device complexity increases due to additional antenna components
Solution Approach 1:
The patent makes each antenna universal by allowing it to serve both transmit and receive functions for its dedicated transceiver. This multi-functionality approach allows dedicated antennas to provide collision-free operation while maintaining cost-effectiveness through shared RF front-end components and processing infrastructure.
Data Source
AI summary
A device including a first transceiver configured to transmit and receive, using a first antenna, according to a first communication protocol, a second transceiver configured to transmit and receive, using a second antenna, according to the first communication protocol, and a third transceiver configured to transmit and receive, using the second antenna, according to a second communication protocol. A controller is configured to select between a first mode where the first, second, and third transceivers are configured to respectively communicate using the first and second antennas at a same time, and a second mode where the first, second, and third transceivers are configured to respectively communicate using the first and second antennas at different times. In the first mode and the second mode, the controller is further configured to selectively allow the second transceiver to transmit and receive using the second antenna at a same time as the third transceiver.