Bluetooth Slave Frame Priority Management in Multi-Wire Coexistence
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Solution Overview
Problem
Conventional communication systems face interference issues when Bluetooth devices and WLAN devices share the same frequency band, particularly when they need to transmit simultaneously, as they lack effective methods to manage priority of slave frames in multiwire coexistence.
Innovation Solution
A method and system for changing the priority of slave frames in multiwire coexistence, where a Bluetooth device communicates high priority status to a collocated WLAN device during a Bluetooth frame, allowing timely acknowledgment without interference by asserting and deasserting specific signals like BT_RF_ACTIVITY and BT_PRIORITY_STATUS, enabling simultaneous operation without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Bluetooth device and WLAN device transmit simultaneously in the same frequency band, then communication functionality is maintained, but signal interference occurs between the two systems
Solution Approach 1:
The patent applies preliminary action by having the Bluetooth slave device determine priority status and assert the BT_PRIORITY_STATUS signal before the Bluetooth frame transmission begins. This advance signaling allows the WLAN device to prepare for potential interference and adjust its transmission accordingly, preventing harmful interference before it occurs
Solution Approach 2:
The patent introduces an intermediary signaling mechanism using dedicated coexistence signals (BT_RF_ACTIVITY, BT_PRIORITY_STATUS) that mediate between Bluetooth and WLAN devices. These intermediary signals enable the two systems to coordinate their transmissions and avoid simultaneous interference, allowing both to operate in the same frequency band
2Loss of time
If Bluetooth slave device asserts high priority to WLAN device after frame start, then timely acknowledgment is achieved, but coordination complexity increases
Solution Approach 1:
The patent applies dynamics by allowing the Bluetooth slave device to dynamically change priority status during the frame transmission. The slave device can assert high priority mid-frame when needed for timely acknowledgments, and the system adapts to this dynamic change through the multiwire coexistence interface that continuously monitors and responds to priority status changes
Data Source
AI summary
Methods and systems for changing priority of slave frames in multiwire coexistence are disclosed. Aspects of one method may include communicating a high priority to the collocated WLAN device after a Bluetooth frame has started, the Bluetooth device may deassert a signal to a collocated WLAN device that indicates Bluetooth communication activity. For example, the deassertion may take place prior to a portion of a frame when said Bluetooth device transmits data. The Bluetooth device may also assert the signal that indicates Bluetooth communication activity. The Bluetooth device may then assert a signal that indicates Bluetooth priority status and the signal that indicates Bluetooth communication activity. After the Bluetooth device transmits a packet, the Bluetooth device may deassert the signal that indicates Bluetooth priority status and/or the signal that indicates Bluetooth communication activity.