Cooperative Transceiving Between Wireless Interface Devices
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Solution Overview
Problem
The interference between WLAN and Bluetooth technologies, which share the same 2.4 GHz frequency band, leads to degraded data throughput, reduced voice quality, and link disconnection due to mutual interference, especially when implemented on a single chip and sharing radio components.
Innovation Solution
The implementation of a high-speed data bus for wireless communication devices to enable direct communication between wireless interface devices, allowing them to coordinate their activities and exchange cooperation data to minimize interference, such as delaying transmissions and adapting frequency hopping sequences to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If WLAN and Bluetooth devices share the same 2.4 GHz frequency band, then device complexity is reduced and cost is lowered, but interference occurs leading to degraded data throughput and reduced voice quality
Solution Approach 1:
The patent applies preliminary action by having the first wireless interface device send cooperation data to the second wireless interface device before the second device transmits packets. This allows the second device to advance knowledge of upcoming transmissions and adjust its timing accordingly, preventing interference before it occurs. The cooperation data includes information about packet transmission timing that enables the second device to delay its transmissions and avoid interfering with the first device's operations.
2Device complexity
If WLAN and Bluetooth devices share the same 2.4 GHz frequency band, then device complexity is reduced and cost is lowered, but interference occurs leading to link disconnection
Solution Approach 1:
The patent implements feedback by establishing a communication channel between the first and second wireless interface devices where they exchange cooperation data. The first device provides feedback about its transmission schedule to the second device, which then adjusts its transmission timing based on this feedback. This closed-loop feedback mechanism ensures that the second device can adapt its behavior to maintain link stability while avoiding interference with the first device's communications.
3Reliability
If wireless interface devices coordinate activities by exchanging cooperation data, then interference is reduced and voice quality is maintained, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies universality by using the existing data bus infrastructure within the host device to carry cooperation data between wireless interface devices. Rather than creating a separate dedicated communication channel, the system repurposes the existing high-speed data bus for dual functionality: normal data processing and coordination communication. This approach minimizes additional hardware complexity while enabling the interference avoidance mechanisms necessary for maintaining voice quality.
Data Source
AI summary
A circuit includes a first wireless interface circuit that transceives packetized data with a first external device in accordance with a first wireless communication protocol. A second wireless interface circuit transceives packetized data with a second external device in accordance with a second wireless communication protocol and wherein the operation of the second wireless interface circuit interferes with the operation of the first wireless interface circuit. A processing module selectively preempts use of the second frequency spectrum by the second external device using a plurality of preemption modes including a first preemption mode and a second preemption mode.