Bluetooth WLAN Coexistence on SOC via Packet Transfer Scheduler
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Solution Overview
Problem
Bluetooth and IEEE 802.11 g devices experience significant interference when collocated, leading to reduced communication efficiency and potential system crashes due to low radio frequency isolation and mutual interference, which existing techniques struggle to fully mitigate without compromising communication rates or requiring additional hardware.
Innovation Solution
A system-on-a-chip (SOC) device integrates Bluetooth and IEEE 802.11 g technologies, utilizing a packet transfer scheduler to coordinate transmissions based on priority levels, promoting or demoting priority for WLAN and Bluetooth communications dynamically to manage interference and ensure efficient coexistence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If Bluetooth and WLAN radios are collocated in close proximity to reduce device size and cost, then device integration and miniaturization are improved, but radio frequency isolation deteriorates leading to mutual interference and desensitization
Solution Approach 1:
The patent segments the operation of Bluetooth and WLAN radios into distinct time slots and channels. The radio frequency spectrum is divided into multiple channels, and transmission opportunities are segmented into Bluetooth-specific, WLAN-specific, and shared periods, reducing mutual interference while maintaining close physical proximity
Solution Approach 2:
The patent implements periodic action by establishing regular transmission cycles with alternating Bluetooth and WLAN transmission opportunities. The system uses periodic channel assessments and structured transmission windows where each radio type gets dedicated time periods, creating a rhythmic pattern that prevents continuous interference
2Reliability
If transmit power control is used to maintain Bluetooth link quality, then communication reliability is improved, but front-end isolation between radios deteriorates due to power stepping up
Solution Approach 1:
The patent applies preliminary action by assessing channel conditions and determining transmit power levels before actual transmission begins. The system performs channel assessments during dedicated periods and pre-configures power levels and transmission opportunities, preventing interference issues rather than reacting to them
Solution Approach 2:
The patent implements dynamics by making transmit power levels and transmission opportunities adjustable based on real-time channel conditions. The system dynamically modifies power levels and transmission schedules according to assessed signal quality and interference levels, optimizing both reliability and isolation
3Productivity
If WLAN communication is given priority to maintain high communication rates, then WLAN throughput is improved, but Bluetooth communication access deteriorates due to bandwidth starvation
Solution Approach 1:
The patent segments transmission opportunities into distinct WLAN periods and Bluetooth periods, ensuring each technology receives dedicated bandwidth allocation. This segmentation guarantees minimum access for Bluetooth while allowing WLAN to utilize available capacity during its designated time slots
Solution Approach 2:
The patent maintains continuity of useful action by ensuring both WLAN and Bluetooth communications can proceed without prolonged interruptions. The structured alternating schedule ensures continuous operation for both technologies, preventing bandwidth starvation while maintaining high overall system utilization
4Productivity
If collocated radios operate simultaneously to maximize resource utilization, then system efficiency is improved, but mutual interference increases causing packet collisions and communication slowdown
Solution Approach 1:
The patent implements periodic action by establishing regular cycles of Bluetooth transmission opportunities followed by WLAN transmission opportunities. This periodic structure ensures that when one radio transmits, the other remains silent, eliminating packet collisions while maintaining high overall resource utilization through the alternating pattern
Solution Approach 2:
The patent maintains continuity of useful action by ensuring both Bluetooth and WLAN communications can proceed without prolonged interruptions. The structured alternating schedule with shared periods ensures continuous operation for both technologies, preventing communication slowdown while maximizing resource utilization
Data Source
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AI summary
Certain embodiments of the invention may be found in a method and system for collaborative coexistence between Bluetooth and IEEE 802.11 g with both technologies integrated onto an SOC device. ln a single integrated circuit (IC) that handles Bluetooth and WLAN technologies, a WLAN priority level may be selected for WLAN transmissions and a Bluetooth priority level may be selected for Bluetooth transmissions. The WLAN and Bluetooth priority levels may be selected from a plurality of priority levels. A packet transfer scheduler (PTS) may schedule the transmission of WLAN and Bluetooth signals in accordance with the selected priority levels. In some instances, the PTS may promote or demote the priority levels for WLAN and/or Bluetooth transmissions based on traffic needs.