PPDU Transmission Control Before Low-Latency TWT Service Periods
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Solution Overview
Problem
Low-latency stations (STAs) in a Basic Service Set (BSS) may not be able to perform timely frame exchanges due to interference from other STAs during designated Service Periods (SPs) in Target Wake Time (TWT) mechanisms, leading to unpredictable delays in low-latency data transmission.
Innovation Solution
Implementing a method where STAs transmit or refrain from transmitting Physical Layer Protocol Data Units (PPDUs) based on a target duration before the start of a next low-latency SP, ensuring they do not overlap with or delay the designated transmission by considering the start time of the next low-latency SP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If TWT scheduling is implemented to manage BSS behaviors, then energy efficiency and contention relief are improved, but low-latency frame exchange reliability deteriorates due to interference from other STAs
Solution Approach 1:
The patent applies preliminary anti-action by having the STA evaluate the target duration before the next low-latency SP start time and proactively adjust transmission behavior. When the target duration exceeds the threshold, the STA refrains from transmitting PPDUs that would interfere with the upcoming low-latency SP, thereby preventing interference before it occurs and ensuring reliable frame exchange for low-latency services
Solution Approach 2:
The patent implements dynamics by making the transmission behavior adaptive based on real-time conditions. The STA dynamically adjusts whether to transmit or refrain from transmitting PPDUs based on the evaluated target duration and threshold comparison, allowing the system to balance between normal transmission efficiency and low-latency service protection under different traffic conditions
2Productivity
If STAs transmit PPDUs within acquired TXOP, then transmission productivity is improved, but low-latency SP timing accuracy deteriorates due to unpredictable delays
Solution Approach 1:
The patent applies preliminary action by having the STA perform evaluation and decision-making before the actual transmission occurs. The STA calculates the target duration, compares it with the threshold, and determines transmission behavior in advance, ensuring that low-latency SP timing accuracy is maintained while allowing normal transmissions to proceed when they will not cause interference
3Speed
If frame exchange is performed without duration evaluation, then transmission speed is improved, but interference with low-latency SP increases
Solution Approach 1:
The patent implements feedback by using the target duration evaluation result to control transmission behavior. The system continuously monitors the time relationship between current transmission opportunities and upcoming low-latency SPs, and adjusts transmission decisions based on this feedback, thereby preventing interference while maintaining transmission efficiency when conditions permit
Data Source
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AI summary
Provided are a wireless communication method, a station device and an access point device, which ensure that other stations within a basic service set (BSS) do not affect a frame exchange performed in a timely manner by a station, which supports a low-latency service, within a specified service period (SP). The wireless communication method comprises: according to a frame exchange allowed within a target duration before a starting point of the next low-latency service period in a basic service set (BSS), a station device determining, upon obtaining a transmission opportunity or within the obtained transmission opportunity, whether to send a physical protocol data unit (PPDU).