Dynamic Modulation Scheme Switching in Bluetooth Links
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Solution Overview
Problem
Existing Bluetooth communication modes cannot dynamically change modulation schemes or stream parameters without terminating and reestablishing the wireless link, leading to unnecessary latency and reduced throughput due to the time required for link termination and reestablishment.
Innovation Solution
A method and device that allow dynamic switching of modulation schemes and stream parameters while maintaining an existing wireless connection by signaling new modulation schemes and stream parameters through control packets, enabling the transmission of packets modulated according to the new scheme without terminating the connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmitting device changes the modulation scheme dynamically, then the throughput and adaptability to channel conditions improve, but the device complexity and signaling overhead increase
Solution Approach 1:
The patent applies parameter changes by dynamically modifying the modulation scheme (e.g., from 1M to 2M or Coded modulation) based on channel conditions. The transmitting device selects different modulation parameters (data rate, coding rate) and signals them to the receiving device, enabling adaptive throughput optimization without hardware changes.
Solution Approach 2:
The patent implements dynamics by allowing the modulation scheme to change over time based on channel quality. The system transitions from static modulation selection to dynamic adaptation, where the modulation parameters are updated periodically or event-driven, enabling the system to respond to varying channel conditions while maintaining connection state.
2Adaptability or versatility
If the transmitting device changes the stream parameters dynamically, then the adaptability to different transmission requirements improves, but the device complexity and configuration overhead increase
Solution Approach 1:
The patent applies parameter changes by dynamically modifying stream parameters such as packet length, access address, and channel allocation based on transmission requirements. The transmitting device selects appropriate parameter sets and signals them to the receiving device, enabling flexible adaptation to different application needs without increasing hardware complexity.
Solution Approach 2:
The patent applies preliminary action by pre-defining multiple sets of stream parameters that can be selected and activated based on current transmission requirements. Instead of configuring parameters in real-time during transmission, the system prepares multiple configuration sets in advance and switches between them, reducing the complexity of real-time configuration management.
3Reliability
If a conservative modulation scheme is selected to guarantee reliability, then the reliability improves, but the throughput decreases due to additional time resources required
Solution Approach 1:
The patent resolves this contradiction by making the modulation scheme dynamic rather than static. The system can switch between conservative modulation (e.g., Coded modulation with lower data rate but higher reliability) and aggressive modulation (e.g., 2M with higher data rate but lower reliability) based on real-time channel conditions, thus achieving both reliability guarantees and throughput optimization at different times.
Solution Approach 2:
The patent applies parameter changes by adjusting the modulation parameters (data rate, coding rate) based on channel quality metrics. When channel conditions are poor, the system selects conservative parameters to ensure reliability; when conditions improve, it switches to aggressive parameters to maximize throughput, thus dynamically balancing the reliability-throughput tradeoff.
Data Source
AI summary
This disclosure provides methods, devices and systems for signaling modulation schemes and stream parameters such that the modulation schemes and stream parameters can be adapted dynamically while maintaining an existing wireless connection. Some implementations include signaling, via a first channel, a set of stream parameters that govern communications on a second channel when a particular modulation scheme is used to modulate the packets transmitted via the second channel. A transmitting device may select a respective set of stream parameters for each of multiple modulation schemes. For example, in addition to an initial modulation scheme and set of stream parameters, the transmitting device can select alternative modulation schemes and sets of stream parameters that are optimized for the respective modulation schemes. The transmitting device signals the modulation schemes and the respective sets of stream parameters via the first channel in advance of switching modulation schemes for the second channel. The transmitting device is enabled to change the modulation scheme and the set of stream parameters on the fly by including an indication of the modulation scheme in the next packet it transmits via the second channel.