Dynamic Physical Layer Switching for BLE Audio CIS Links
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Solution Overview
Problem
Bluetooth Low Energy (BLE) communication technologies face challenges in dynamically changing the physical layer transmission method during audio services, leading to inefficiencies and poor audio quality due to the inability to real-time adapt to changes in the wireless environment, especially in scenarios like entering a weak electric field state.
Innovation Solution
Implementing a method where electronic devices can dynamically change the physical layer transmission scheme for isochronous streams based on a predetermined policy, switching between different physical layers (such as LE 1M, LE 2M, Coded PHY with S=2, and Coded PHY with S=8) at designated time intervals to optimize communication quality and adapt to changing environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed physical layer transmission method is used in Bluetooth Low Energy (BLE) communication for audio services, then device complexity is reduced and ease of operation is improved, but adaptability to changing wireless environments deteriorates and audio quality suffers
Solution Approach 1:
The patent implements dynamic switching between different physical layer transmission methods (LE 1M, LE 2M, Coded PHY with S=2, Coded PHY with S=8) based on real-time wireless environment conditions. The system transitions from a static fixed PHY approach to a dynamic adaptive approach where the transmission method changes according to channel quality, signal strength, and environmental factors, thereby resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The system changes physical layer parameters (transmission rate, coding scheme, symbol rate) based on detected wireless conditions. By monitoring signal quality and adjusting PHY parameters dynamically, the system achieves adaptability to varying environments while maintaining manageable complexity through standardized parameter sets defined in the Bluetooth specification.
2Reliability
If the physical layer transmission method is changed dynamically during audio services, then adaptability to environmental changes is improved and audio quality is enhanced, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors wireless channel quality, signal strength, and transmission success rates, then uses this feedback to dynamically adjust the physical layer transmission method. The feedback loop enables reliable communication by automatically selecting the appropriate PHY mode based on real-time conditions, managing complexity through event-driven decision-making rather than continuous complex processing.
Solution Approach 2:
The communication system performs self-adjustment by automatically selecting and switching between different physical layer methods based on detected environmental conditions without requiring manual intervention or complex external control. The system serves itself by monitoring its own performance and adapting transmission parameters autonomously, thereby improving reliability while keeping control complexity manageable.
3Reliability
If multiple physical layer transmission schemes are supported and switched between, then adaptability and audio quality are improved, but loss of time occurs during PHY switching operations
Solution Approach 1:
The patent prepares multiple physical layer transmission schemes in advance and pre-configures the switching mechanisms during device pairing and connection establishment. By having the PHY switching capability prepared beforehand and maintaining ready-state alternative transmission methods, the system minimizes actual switching time during operation, reducing the time loss while maintaining the ability to switch between LE 1M, LE 2M, and Coded PHY modes as needed.
Data Source
AI summary
A first electronic device may include a communication circuit and at least one processor. The at least one processor may be configured to: establish a BLE communication link with a second electronic device; on the basis of the BLE communication link, identify a physical layer transmission scheme (PHY) change policy indicating a change in the PHY, the PHY being used in a CIS link for an audio service between the first electronic device and the second electronic device; initiate the CIS link according to the PHY change policy; determine a PHY for a first time interval of the CIS link, as a first PHY on the basis of the PHY change policy; transmit a first audio packet generated using the first PHY to the second electronic device in the first time interval through the CIS link; determine a PHY for a second time interval of the CIS link, as a second PHY on the basis of the PHY change policy; and transmit a second audio packet generated using the second PHY to the second electronic device in the second time interval through the CIS link.