Connected Isochronous Stream Retransmission Tuning by Link Quality
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Solution Overview
Problem
Current wireless Bluetooth connections, such as connected isochronous stream (CIS) connections, follow rigid timing protocols that require re-configuration and re-negotiation to adjust transmission opportunities, leading to latency and potential disruptions in communication.
Innovation Solution
Wireless devices dynamically adjust transmission opportunities for retransmissions based on link quality, using parameters like burst number (BN) and flush timeout (FT), without changing the timing of the CIS, to adapt to changing link conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rigid timing protocols are used in connected isochronous streams, then connection stability is maintained, but adaptability to link quality changes deteriorates
Solution Approach 1:
The patent applies dynamics by making the retransmission opportunity count variable rather than fixed. The system dynamically adjusts the number of retransmission opportunities based on real-time link quality indicators (LQIs) and modulation and coding schemes (MCS), allowing the connection to adapt to changing conditions while maintaining the isochronous stream structure. This resolves the contradiction by enabling adaptability without sacrificing connection stability.
Solution Approach 2:
The patent changes the parameter of retransmission opportunity count based on link quality conditions. By monitoring LQIs and MCS values, the system adjusts this parameter to optimize performance under different link conditions. This allows the system to maintain stability through structured parameter changes rather than protocol reconfiguration, resolving the contradiction between stability and adaptability.
2Reliability
If the number of retransmission opportunities is increased, then reliability improves, but data rate deteriorates
Solution Approach 1:
The patent dynamically changes the retransmission opportunity parameter based on link quality. When link quality is good, fewer retransmission opportunities are allocated, maximizing data rate. When link quality deteriorates, more retransmission opportunities are allocated, improving reliability. This conditional parameter adjustment resolves the contradiction by optimizing the trade-off based on actual link conditions.
Solution Approach 2:
The system dynamically adjusts retransmission opportunities rather than using a fixed count. This dynamic adjustment allows the system to achieve high reliability when needed while maintaining high data rates when link conditions permit, resolving the static trade-off between reliability and productivity.
3Adaptability or versatility
If dynamic adjustments to transmission opportunities are implemented, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where devices monitor link quality indicators and modulation coding schemes, then use this feedback to adjust retransmission opportunities. This feedback-driven approach enables adaptability through relatively simple decision logic based on monitored parameters, rather than complex protocol negotiations, resolving the contradiction between adaptability and device complexity.
4Loss of time
If reconfiguration of the entire connection is avoided, then latency is reduced, but ease of operation deteriorates
Solution Approach 1:
The patent extracts the dynamic adjustment capability from the overall connection configuration. Instead of reconfiguring the entire connection, only the retransmission opportunity parameter is adjusted independently. This extraction allows rapid adaptation without the latency of full reconfiguration while maintaining operational simplicity through parameter-level control, resolving the contradiction between latency and ease of operation.
Data Source
AI summary
Methods, systems, and devices for techniques for dynamically adjusting retransmission opportunities within a connected isochronous stream (CIS) are described. In some aspects, a first wireless device and a second wireless device may support one or more dynamic or “on-the-fly” adjustments to one or more CIS settings in accordance with a link quality between the first wireless device and the second wireless device. For example, the first wireless device and the second wireless device may tie a number of transmission opportunities that are usable for retransmissions, within a given isochronous (ISO) interval, to the link quality between the first wireless device and the second wireless device. The link quality may be tied or associated with a modulation and coding scheme (MCS) of the link. As such, the first wireless device and the second wireless device may tie a dynamic change in MCS to a dynamic change in retransmission opportunities.