Wireless Broadcast Audio BIG Links for Low-Latency Multi-Channel Transmission
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Solution Overview
Problem
The existing Bluetooth Low Energy (BLE) audio technology's Broadcast Isochronous Group (BIG) link is limited by a maximum physical layer transmission rate of 2 Mbps, supports only multiple BIS links with time-division multiplexing, and lacks flexibility for low-latency, high-reliability Multi-Channel Wireless Broadcast Audio (MCWBA) with more than two channels, and does not support asymmetric MCWBA transmission with different audio parameters.
Innovation Solution
A wireless audio data transmission method that forms different broadcast data packets based on distinct broadcast link information, establishing separate Broadcast Isochronous Group (BIG) links with different receiving devices, allowing for flexible multi-channel wireless broadcast audio by using at least two frequency-division multiplexed BIG links with time-domain overlapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple BIS links use time-division multiplexing on the BIG link, then the system can support multi-channel audio transmission, but the transmission latency increases and reliability decreases
Solution Approach 1:
The patent transitions from time-division multiplexing to frequency-division multiplexing by introducing multiple physical layer transmission rates (2 Mbps, 12 Mbps, 48 Mbps). Different audio channels are transmitted simultaneously over different frequency channels within the BIG link, eliminating the time-multiplexing delay while supporting multi-channel audio transmission.
Solution Approach 2:
The patent changes the transmission rate parameter to resolve the contradiction. By supporting multiple physical layer transmission rates (2 Mbps, 12 Mbps, 48 Mbps) and assigning different rates to different audio channels, the system achieves both multi-channel support and low latency through parallel transmission at optimized rates for each channel's requirements.
2Quantity of substance
If the BIG link uses a single transmission rate of 2 Mbps, then the system maintains compatibility with existing BLE audio standards, but the bandwidth is insufficient for high-quality multi-channel audio transmission
Solution Approach 1:
The patent makes the BIG link universal by supporting multiple physical layer transmission rates (2 Mbps, 12 Mbps, 48 Mbps) within a single link framework. The system can adaptively select appropriate transmission rates based on audio quality requirements, maintaining backward compatibility with 2 Mbps while enabling high-bandwidth multi-channel transmission at higher rates when needed.
Solution Approach 2:
The patent introduces dynamic transmission rate selection where the BIG link can adjust its physical layer transmission rate based on the specific audio transmission requirements. Different audio channels can be assigned different transmission rates dynamically, allowing the system to optimize bandwidth utilization while managing complexity through adaptive configuration.
3Adaptability or versatility
If all BIS links share identical link parameters, then the system simplifies configuration and management, but it cannot support asymmetric multi-channel audio transmission with different audio parameters
Solution Approach 1:
The patent applies local quality by allowing different BIS links within the BIG link to have different physical layer transmission rates (2 Mbps, 12 Mbps, 48 Mbps) and different audio parameters. Each audio channel can be configured with locally optimized parameters suitable for its specific requirements, enabling asymmetric multi-channel audio transmission while the BIG link framework manages the overall configuration.
Data Source
AI summary
The present disclosure provides a wireless audio data transmission method and related devices. The method comprises: broadcasting, by a transmitting device, a hybrid auxiliary synchronization packet to a plurality of receiving devices. The hybrid auxiliary synchronization packet comprises a first link information and a second link information, the first link information is used by a first receiving device among the plurality of receiving devices to synchronize with the transmitting device and establish a first Broadcast Isochronous Group (BIG) link, and the second link information is used by a second receiving device among the plurality of receiving devices to synchronize with the transmitting device and establish a second BIG link; transmitting a first broadcast data packet based on the first BIG link, and/or transmitting a second broadcast data packet based on the second BIG link. The method enables more flexible applications of multi-channel wireless broadcast audio.