Bluetooth Retransmission Control for Audio Packet Reliability
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Solution Overview
Problem
Bluetooth-based data transmission experiences packet errors and delays due to interference from other wireless interfaces, leading to sound cutoffs and negative impacts on RF environments, and existing solutions like retransmission schemes and power control are inadequate for ensuring real-time data quality.
Innovation Solution
An electronic device with processors and communication circuits dynamically detects communication states to adjust retransmission configuration values, such as retransmission count, power level, and time periods, based on environmental conditions, to optimize Bluetooth data transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed retransmission count is used for Bluetooth audio packet transmission, then the transmission protocol is simple and device complexity is low, but packet errors and sound cutoffs occur in poor RF environments due to interference from other wireless interfaces
Solution Approach 1:
The patent implements dynamic retransmission control where the retransmission count is adjusted based on detected communication states and RF environment conditions. Instead of using a fixed retransmission count, the system dynamically modifies the retransmission count parameter according to real-time channel quality, interference levels, and packet loss rates, thereby resolving the contradiction between transmission reliability and device complexity
Solution Approach 2:
The system employs feedback mechanisms by continuously monitoring communication state parameters such as packet error rates, signal strength, and interference levels. Based on this feedback, the retransmission count is adaptively adjusted to maintain optimal transmission reliability while avoiding unnecessary retransmissions that would increase complexity and power consumption
2Reliability
If audio packet retransmission is performed continuously to ensure data quality, then transmission reliability improves, but time slots are occupied and negative impacts are caused on RF environments of other RF devices
Solution Approach 1:
The patent applies partial action by performing retransmission only when necessary based on detected communication states. Instead of continuous retransmission, the system selectively retransmits packets only when packet loss or errors are detected, thereby maintaining data quality while minimizing occupancy of time slots and reducing harmful interference to other RF devices
Solution Approach 2:
The system changes transmission parameters dynamically by adjusting retransmission count, transmission power, and time slot allocation based on RF environment conditions. This parameter adaptation allows the system to maintain reliable data transmission while minimizing negative impacts on the overall RF environment by reducing unnecessary transmissions
3Reliability
If transmission power control is used to prevent transmission failure, then packet transmission reliability improves, but devices that do not support transmission power control cannot benefit and fixed transmission power causes instantly occurring transmission loss in poor RF environments
Solution Approach 1:
The patent implements a universal retransmission control mechanism that works across devices with different capabilities. By using communication state detection and dynamic retransmission count adjustment, the system achieves transmission reliability improvement without requiring transmission power control support, making it compatible with both power-controlled and fixed-power devices
Solution Approach 2:
The system replaces the mechanical approach of adjusting transmission power with an information-based approach using communication state detection and software-controlled retransmission. This substitution allows the same mechanism to work across different device types without requiring hardware modifications or power control support
4Reliability
If retransmission is performed to minimize packet loss, then data quality improves, but sound source loss occurs and sound cutoff phenomena appear due to transmission failure in poor RF environments
Solution Approach 1:
The patent applies preliminary action by proactively adjusting retransmission parameters based on predicted communication states and historical performance data. The system prepares retransmission strategies in advance based on detected trends in RF environment quality, preventing sound cutoffs before they occur by ensuring packets are retransmitted before playback deadlines are missed
Data Source
AI summary
According to an embodiment of the present invention, an electronic device for Bluetooth-based data transmission may comprise: a housing; a first communication circuit which is located inside the housing and uses a first band; a second communication circuit which is located inside the housing and uses the first band; a processor electrically connected to the first communication circuit and the second communication circuit; and a memory located inside the housing and electrically connected to the processor, wherein the memory stores instructions configured to, when executed, cause the processor to detect a communication state of at least one of the first communication circuit and the second communication circuit, and control retransmission of at least a part of data having been transmitted to an external electronic device via the first communication circuit, on the basis of the detected communication state. Various other embodiments are possible.