Wi-Fi Uplink Resource Preemption for Low-Latency PPDU Traffic
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Solution Overview
Problem
Wi-Fi systems face challenges in achieving low latency in uplink Trigger Based Physical Protocol Data Unit (PPDU) transmissions, necessitating improved methods to realize low latency services.
Innovation Solution
A station device is allowed to transmit a low latency service using a resource allocated by an access point device for PPDU transmission, with the option to preempt resources when certain conditions are met, ensuring timely delivery of latency-sensitive data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a station device uses a resource allocated for PPDU transmission to transmit low latency service data, then the latency requirement for the service is satisfied, but the original PPDU transmission may be affected
Solution Approach 1:
The access point device performs preliminary actions by allocating resources in advance and setting up preemption mechanisms before the actual transmission occurs. The station device prepares to preempt the allocated resource when low latency service data arrives, ensuring that the resource can be quickly reallocated without waiting for the original PPDU transmission to complete, thus reducing latency while maintaining transmission reliability through controlled preemption conditions.
2Speed
If the access point device allows station devices to preempt resources for low latency services, then low latency transmission is enabled, but the resource allocation complexity increases
Solution Approach 1:
The access point device applies local quality by differentiating resource allocation based on service type and latency requirements. Instead of uniform resource allocation, the system assigns different qualities of service to different data streams, allowing low latency services to preempt resources when needed while maintaining normal service quality for other traffic. This differentiated approach enables high transmission speed for critical services without proportionally increasing overall system complexity.
3Productivity
If the station device transmits low latency service data using allocated PPDU resources, then transmission efficiency improves, but conflicts with existing PPDU transmission schedules
Solution Approach 1:
The transmission schedule transitions from a static, fixed allocation to a dynamic, flexible schedule that can adapt in real-time. When low latency service data arrives, the station device can dynamically preempt the allocated resource and switch to transmitting the low latency service, while the access point device manages the schedule stability by coordinating preemption conditions and ensuring smooth transitions. This dynamic approach improves transmission efficiency for time-sensitive data while maintaining overall schedule stability through controlled adaptability.
Data Source
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AI summary
Provided are a wireless communication method, a station device, and an access point device. The method comprises: a station device using a part of resources in first resources to transmit a first service when a first condition is satisfied, wherein the first resources are resources allocated by an access point device for transmitting a physical layer protocol data unit (PPDU), and the latency requirement of data carried in the TB PPDU is lower than the latency requirement of the first service.