TWS Earbud Packet Loss Forwarding via Spatial Diversity
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Solution Overview
Problem
Current True Wireless Stereo (TWS) systems face challenges in maintaining data stability due to deep fading signals caused by the human body, leading to packet loss errors in Bluetooth communication networks, which existing error correction methods are unable to effectively address.
Innovation Solution
A method and system where a first audio playback device and a second audio playback device form a pair, with the first device switching to a sending state upon monitoring retransmission information from an audio source device, and forwarding audio data to the second device via an interactive link, maintaining synchronization with the audio source's data transmission sequence, and selecting the best link for error correction based on monitored retransmission and forwarding information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one side earbud forwards or mobile phone retransmits for error correction, then packet loss can be corrected, but deep fading caused by human body cannot be overcome
Solution Approach 1:
The patent introduces a dual wireless network architecture where a first earbud acts as an intermediary node. When the second earbud fails to receive data from the mobile phone, the first earbud receives and forwards the data through a different spatial path, bypassing the deep fading caused by the human body. This intermediary forwarding mechanism resolves the contradiction by providing an alternative transmission route that avoids the harmful fading effect.
2Device complexity
If a single wireless link is used for audio data transmission, then the system is simple, but data stability deteriorates due to deep fading
Solution Approach 1:
The patent segments the single wireless transmission path into multiple independent links: Link 1 (mobile phone to first earbud), Link 2 (mobile phone to second earbud), and Link 3 (first earbud to second earbud). This segmentation allows the system to select optimal paths and implement error correction through cooperative communication, resolving the contradiction between system simplicity and transmission stability.
Solution Approach 2:
The patent transitions from a single-dimension transmission model to a multi-dimensional wireless network. By introducing spatial diversity through multiple earbuds acting as both receivers and potential forwarders, the system creates additional transmission dimensions that bypass deep fading zones, thereby improving reliability without significantly increasing complexity.
3Loss of information
If the successful side becomes a forwarder in subsequent slots, then error correction is achieved, but the system cannot overcome deep fading caused by human body position
Solution Approach 1:
The patent implements preliminary monitoring of transmission quality on all links before packet loss occurs. The first earbud continuously monitors Link 1 and Link 3, and the second earbud monitors Link 2, preparing forwarding capabilities in advance. This preliminary action allows the system to quickly switch to alternative paths when deep fading is detected, preventing packet loss rather than just correcting it afterward.
Data Source
AI summary
A method, circuit, audio playback device, and system of sending and receiving Bluetooth packet loss data is disclosed. The method includes: step S100, receiving a forwarding request sent by a second audio playback device in a receiving state; step S200, monitoring the retransmission information of an audio source device retransmitting current audio data on Link 1 according to the forwarding request; step S300, determining whether the retransmission information is monitored; step S400, switching from the receiving state to a sending state; and step S500, forwarding the current audio data to the second audio playback device through Link 2 in accordance with the time sequence of the audio source device retransmitting the current audio data. The signal can be provided to the second audio playback device from different locations.