Frame Drop Reporting in Low Latency WLAN
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Solution Overview
Problem
Current wireless local area network (WLAN) systems face challenges in efficiently reporting frame drops due to latency, which affects performance and requires immediate notification to prevent further drops.
Innovation Solution
A method where a station (STA) in a WLAN system transmits a physical protocol data unit (PPDU) containing low-latency traffic information, including size and time data, and frame drop information, allowing the access point (AP) to allocate additional resources to prevent frame drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the STA transmits frame drop information immediately when a frame drop occurs, then the latency performance is improved and the AP can allocate resources timely, but the overhead of additional signaling increases
Solution Approach 1:
The patent combines frame drop information with buffer status information into a single Buffer Status Report (BSR) message. Instead of transmitting separate signaling for frame drop notification, the STA merges the frame drop indicator with the existing buffer status reporting mechanism, thereby reducing signaling overhead while enabling timely notification to the AP for latency-critical traffic
Solution Approach 2:
The patent implements a feedback mechanism where the STA monitors its own buffer status and frame drop conditions, then reports this information back to the AP through the BSR. The AP uses this feedback to dynamically allocate uplink resources, creating a closed-loop system that responds to actual network conditions and prevents future frame drops
2Reliability
If the AP allocates additional uplink resources to prevent frame drops, then the reliability of low-latency traffic transmission is improved, but the resource utilization efficiency may deteriorate
Solution Approach 1:
The patent implements dynamic resource allocation where the AP adjusts uplink resource allocation based on real-time buffer status and frame drop information received from the STA. Instead of static over-provisioning, the system dynamically scales resources to match actual demand, ensuring reliability for low-latency traffic when needed while maintaining high resource utilization efficiency during normal conditions
Solution Approach 2:
The patent changes the allocation parameters (buffer threshold, frame drop indicator) to trigger resource reallocation. When the buffer exceeds a threshold or frame drops are detected, the system changes resource allocation parameters to provide additional uplink capacity, thereby preventing frame drops without permanently over-allocating resources
3Loss of time
If the STA monitors and reports buffer status and frame drop information continuously, then the latency performance is improved, but the processing complexity and energy consumption increase
Solution Approach 1:
The patent applies partial monitoring and reporting by focusing only on low-latency traffic buffers and frame drop events, rather than monitoring all traffic. The STA selectively reports buffer status and frame drop information only when relevant thresholds are exceeded or events occur, reducing processing complexity and energy consumption while maintaining low latency performance for critical traffic
Data Source
AI summary
In a wireless local area network system, a station (STA) can transmit a PPDU including frame drop information. The frame drop information can include information related to whether a frame drop caused by time latency has occurred in the STA.