Bluetooth CIS Swapping for Latency and Bandwidth Optimization
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Solution Overview
Problem
In wireless communication systems, particularly those using Bluetooth, the simultaneous use of multiple networks leads to coexistence issues such as increased latency and bandwidth usage, especially in time-critical communications like streaming audio, due to the inability to dynamically swap connected isochronous streams (CIS) and asynchronous connection-less (ACL) links, resulting in suboptimal resource allocation and power consumption.
Innovation Solution
A mechanism is proposed to dynamically swap CIS ownership between sink apparatuses based on input quality, allowing the apparatus with better characteristics to take ownership of the bidirectional CIS, and optionally swapping ACL ownership, without the involvement of the source apparatus, through stages like informing CIS establishment, swap determination, swapping CIS ownership, marshalling ACL state information, and swapping ACL ownership.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple networks are used simultaneously for communication, then communication versatility is improved, but latency and bandwidth usage increase
Solution Approach 1:
The patent implements dynamic CIS swapping that allows the system to adaptively switch between different communication configurations based on real-time conditions. The sink apparatus can dynamically transfer CIS ownership between itself and another sink apparatus, enabling flexible resource allocation that reduces latency while maintaining multi-network communication capability.
Solution Approach 2:
The system changes operational parameters by swapping CIS ownership states between different sink apparatuses. This parameter change allows the same physical infrastructure to operate in different modes, optimizing bandwidth usage and reducing latency for time-critical communications by selecting the best available configuration.
2Adaptability or versatility
If multiple networks are used simultaneously for communication, then communication versatility is improved, but bandwidth usage increases
Solution Approach 1:
The patent extracts the time-critical communication stream from the congested multi-network environment by swapping CIS ownership to a dedicated configuration. This separation allows audio streaming to use optimized resources while other networks handle different traffic types, reducing overall bandwidth consumption for each specific function.
3Device complexity
If CIS ownership is fixed rather than dynamically swapped, then device complexity is reduced, but resource allocation efficiency decreases
Solution Approach 1:
The sink apparatus autonomously determines when to swap CIS ownership based on local conditions without requiring complex centralized control. This self-service approach allows the system to optimize resource allocation efficiently while keeping the control logic distributed and relatively simple.
4Reliability
If CIS ownership is dynamically swapped based on input quality, then communication quality is improved, but device complexity increases
Solution Approach 1:
The system uses feedback from input quality assessment to trigger CIS ownership swaps. By monitoring communication conditions and automatically responding to quality changes, the system maintains high communication reliability through a relatively simple reactive mechanism rather than complex proactive control.
Data Source
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AI summary
Devices and methods for connected isochronous stream (CIS) swapping are disclosed. In an example Bluetooth™ setting, a smartphone can be connected to multiple earbuds. It is possible that both earbuds include microphones, but only one microphone is enabled at a given time. That is, only one of the CISes established between the smartphone and the earbuds is bidirectional, and the other is unidirectional. The disclosed techniques enable the CISes to be swapped between the earbuds so that the earbud with better microphone quality will have ownership of the bidirectional CIS.