Aggregate PSDU Preemption for Wi-Fi Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Wi-Fi standards face challenges in achieving low average and worst-case latency for ultra-low latency applications due to the increasing number of devices in a Basic Service Set, which hinders the efficient transmission of both small time-critical packets and large packets requiring high throughput.
Innovation Solution
The integration of Aggregate-PSDU frame format with MPDU/PSDU preemption and dedicated Resource Units, along with PPDU/PSDU splitting, enables efficient transmission by prioritizing time-sensitive packets while maintaining high throughput for larger packets, even in heavily loaded networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of Wi-Fi devices in a Basic Service Set increases to support more users, then network coverage and user capacity improve, but transmission latency increases and network performance deteriorates
Solution Approach 1:
The patent segments the aggregated PSDU into multiple smaller units that can be transmitted in separate portions. This segmentation allows the network to break down large data transmissions into manageable chunks, reducing the time each transmission occupies the channel and thereby lowering latency for subsequent packets while maintaining support for multiple devices.
Solution Approach 2:
The patent implements preemption mechanisms that allow high-priority time-sensitive packets to interrupt ongoing transmissions. By preparing and prioritizing critical packets in advance, the system can preempt lower-priority transmissions when needed, ensuring that time-sensitive applications receive timely delivery even in densely populated networks.
2Productivity
If large packets are transmitted to achieve high throughput, then data transfer efficiency improves, but transmission time increases and latency worsens
Solution Approach 1:
The patent divides large packets into smaller segmented PSDU units that can be transmitted in multiple portions. This segmentation maintains high throughput by keeping the channel busy with continuous transmissions while reducing the time any single packet occupies the medium, thereby lowering latency for time-sensitive applications that can request preemption.
Solution Approach 2:
The patent introduces dynamic transmission sizing where packet segmentation and transmission priorities can be adjusted in real-time based on network conditions and application requirements. Time-sensitive applications can trigger dynamic preemption to interrupt ongoing large packet transmissions, while bulk data transfers can utilize larger packet sizes for efficiency when no preemption is needed.
3Productivity
If aggregate PSDU format is used to improve throughput, then data transmission efficiency improves, but flexibility to handle time-critical packets deteriorates
Solution Approach 1:
The patent segments the aggregate PSDU into multiple transmittable units with associated metadata indicating priority levels. This segmentation structure allows the system to maintain efficient aggregate transmission while identifying and extracting high-priority segments for preemption, thereby restoring flexibility to handle time-critical packets within the aggregate format.
Solution Approach 2:
The patent introduces a preemption indication mechanism that acts as an intermediary between the aggregate PSDU transmission system and time-critical packet requirements. This intermediary layer monitors incoming packets, identifies time-critical ones, and triggers preemption of ongoing aggregate transmissions when necessary, bridging the gap between efficient aggregate formatting and flexible time-critical handling.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to enhanced aggregate preemption. A device may divide a transmit opportunity (TXOP) transmission into physical layer convergence procedure service data unit (PSDU) or physical layer (PHY) convergence protocol data unit (PPDU) transmissions. The device may establish fixed time intervals between two continuous PSDU or PPDU transmissions. The device may sense an idle status of a channel after an end of each PSDU or PPDU transmission. The device may send a first suspend request (SR) control frame after an end of receiving a current PSDU or PPDU transmission.