TWT Service Interval Switching for Low-Latency Audio Links
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Solution Overview
Problem
Existing wireless communication systems face high latency issues due to the need for complete teardown and re-establishment of Target Wake Time (TWT) sessions when channel conditions change, which is unsuitable for low-latency applications like ultra-low-latency gaming and streaming lossless audio.
Innovation Solution
Implementing a data-packet-generation-based mechanism where updated TWT parameters are embedded in downlink audio data packets, allowing for immediate parameter updates without additional signaling, thereby reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete teardown and re-establishment of TWT sessions is performed when channel conditions change, then reliability of communication is improved, but latency increases significantly
Solution Approach 1:
The patent implements dynamic TWT session modification without complete teardown. The service interval and service period parameters are adjusted dynamically based on detected trigger conditions (signal strength changes, concurrent links, use state changes, channel congestion) while maintaining the existing session context, thereby avoiding the high latency of complete re-establishment while adapting to changing channel conditions.
Solution Approach 2:
The patent changes TWT parameters (service interval and service period) directly without renegotiating the entire session. By modifying only the necessary parameters in response to trigger conditions, the system achieves adaptability to channel changes with minimal latency, resolving the contradiction between reliability and time loss.
2Stability of the object's composition
If TWT session re-establishment is performed when channel conditions change, then communication stability is improved, but end-to-end delay increases
Solution Approach 1:
The patent performs preliminary parameter updates by embedding modified TWT parameters directly into downlink audio data packets before complete session re-establishment is needed. This allows the audio device to prepare for and adapt to channel condition changes in advance, reducing the end-to-end delay while maintaining communication stability.
Solution Approach 2:
The patent uses downlink audio data packets as an intermediary carrier for TWT parameter updates. Instead of requiring a separate control signal or complete session teardown, the parameter modifications are transmitted through the existing audio data packets, thereby reducing delay while ensuring stable communication.
3Reliability
If traditional TWT parameter update mechanism is used, then protocol compliance is maintained, but adaptation speed to changing conditions is slow
Solution Approach 1:
The patent merges TWT parameter update functionality with the existing downlink audio data packet transmission. By combining parameter embedding with the regular audio data flow, the system maintains protocol compliance while achieving rapid adaptation to channel conditions, as the parameter updates occur simultaneously with normal audio communication without requiring separate update procedures.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device (WCD) may communicate, during a first communication period, with an audio device via a wireless link configured with a first service interval and a first service period. The WCD may communicate, during a second communication period, with the audio device via the wireless link configured with a second service interval and a second service period based at least in part on detection of a trigger condition comprising one or more of: a change of a signal strength, a change of one or more concurrent wireless links on one or more frequency bands that overlap with the wireless link, a change of a use state of the WCD, or a change in channel congestion or interference. Numerous other aspects are described.