Wireless Audio Transmission Over CIS Links for Ultra-Low Latency
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Solution Overview
Problem
Existing wireless audio technologies, such as Bluetooth Low Energy (BLE) and wireless LAN IEEE802.11n, struggle to provide ultra-low latency and high-quality audio transmission due to limited data transmission rates and complex data transmission mechanisms, failing to meet the needs of gaming headset players.
Innovation Solution
Establish a connected isochronous streaming link based on a high-speed physical layer with a data transmission rate higher than BLE, using technologies like IEEE 802.11n, to transmit audio data without compression loss, and employ frequency hopping and dynamic frequency configuration to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If BLE physical layer is used for wireless audio transmission, then power consumption is reduced and cost is lowered, but data transmission rate is limited to maximum 2 Mbps causing high latency
Solution Approach 1:
The patent changes the physical layer parameters from BLE (maximum 2 Mbps) to a high-speed physical layer (minimum 4 Mbps), thereby changing the data transmission rate parameter to achieve lower latency while maintaining reasonable power consumption through optimized transmission protocols
2Loss of time
If high-speed physical layer (e.g., IEEE 802.11n) is used to increase data transmission rate, then latency is reduced, but device complexity increases due to complex data transmission mechanisms
Solution Approach 1:
The patent segments the audio data transmission into connected isochronous stream (CIS) events, where each CIS event contains one or more CIS sub-events. This segmentation allows for structured, manageable transmission blocks with defined timing, reducing the complexity of handling continuous high-speed data flow while maintaining low latency through precise scheduling
3Loss of time
If data transmission rate is increased to provide ultra-low latency service, then audio quality is improved, but synchronization performance may deteriorate due to timing constraints
Solution Approach 1:
The patent implements periodic action through connected isochronous stream (CIS) events that occur at regular isochronous intervals. Each CIS event contains structured sub-events with defined timing for data transmission and acknowledgment, ensuring synchronized operation between transmitter and receiver while maintaining high data transmission rates for low latency
Data Source
AI summary
A wireless audio transmitting method is provided in the present invention. The wireless audio transmitting method comprises: establishing a connected isochronous stream link based on a high-speed physical layer with an audio receiving device by an audio transmitting device, wherein a minimum data transmission rate of the high-speed physical layer is higher than a maximum data transmission rate of a BLE physical layer; and transmitting a first audio data to the audio receiving device through the connected isochronous stream link based on the high-speed physical layer by the audio transmitting device.