Low Latency Wireless Communication via QoS Prioritization
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Solution Overview
Problem
Existing wireless communication technologies, such as those using WiFi protocols, face challenges in achieving low latency and efficient data transmission over shared wireless channels, particularly in scenarios with multiple device pairs requiring different Quality of Service (QoS) levels, leading to inefficiencies and increased latency.
Innovation Solution
The implementation of a low-latency wireless communication system that orders data frames by Quality of Service (QoS) priority within physical layer protocol data units (PPDUs) and limits their duration, using periodic access windows with adjustable offsets to allow multiple device pairs to synchronize on the same wireless channel without central scheduling, ensuring high-priority data is transmitted promptly and efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If data frames are transmitted using standard WiFi protocols without QoS prioritization, then the wireless channel can accommodate all data streams, but latency increases and high-priority data transmission is delayed
Solution Approach 1:
The patent segments data frames into different priority levels (high-priority and low-priority) and transmits them through separate mechanisms. High-priority data frames are transmitted immediately when the wireless channel is available, while low-priority data frames wait for subsequent transmission opportunities, thereby reducing latency for critical data without requiring complete protocol redesign
Solution Approach 2:
The patent applies different transmission quality characteristics to different data frames based on their priority. High-priority data frames receive expedited transmission with minimal delay, while low-priority data frames follow standard transmission timing, allowing the system to optimize performance for critical data streams without compromising the entire communication system
2Productivity
If multiple device pairs share the same wireless channel without centralized scheduling, then device complexity is reduced, but channel collisions increase and transmission efficiency decreases
Solution Approach 1:
The patent implements periodic access windows where device pairs transmit data in alternating time slots. Each device pair waits for a scheduled window to transmit, and the system uses countdown timers to manage transmission timing. This periodic structure allows multiple device pairs to share the channel efficiently without requiring centralized coordination, reducing both collisions and device complexity
Solution Approach 2:
The patent enables device pairs to autonomously manage their own transmissions using local countdown timers and priority-based decision making. Each device pair independently determines when to transmit based on their priority level and the current state of the wireless channel, eliminating the need for centralized scheduling while maintaining efficient channel utilization
3Loss of time
If high-priority data frames are transmitted immediately without waiting for scheduled windows, then latency is reduced, but channel access conflicts with other device pairs increase
Solution Approach 1:
The patent uses countdown timers that start counting down when a device pair first attempts to access the wireless channel. These timers establish expected transmission timing in advance, allowing high-priority data frames to be transmitted immediately when the channel becomes available without causing conflicts with other device pairs, since the timer-based scheduling pre-establishes transmission windows
Data Source
AI summary
The subject disclosure provides systems and methods for low-latency point-to-point communication between electronic devices. In one or more implementations, low latency can be achieved by including data in transmission units, in order of priority up to a maximum duration for the transmission unit. In an example in which the communication occurs over a WiFi channel, the transmission unit may be a multi-TID AMPDU, and the priority may be based on a Quality of Service (QoS) category as identified by the traffic identifier (TID). The communication may be exchanged using a periodic access window that can be adaptively offset, to efficiently share bandwidth with other device pairs on the same wireless channel. Base and client devices can be time synchronized, and transmission opportunity (TXOP) bursting can be allowed, in one or more implementations.