Station Resource Preemption for Low-Latency TB PPDU Uplink
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Solution Overview
Problem
Wi-Fi systems face challenges in achieving low latency for uplink Trigger Based (TB) Physical Protocol Data Unit (PPDU) transmissions, as existing methods do not effectively address how to realize low latency services in TB PPDUs.
Innovation Solution
A station device preempts resources allocated for PPDU transmission to transmit low latency services when certain conditions are met, using time domain, frequency domain, or spatial domain resources allocated by an access point, and employs resource preemption techniques to ensure timely delivery of low latency data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If resource preemption is implemented to transmit low latency services, then latency requirement is improved, but resource allocation complexity increases
Solution Approach 1:
The access point device performs preliminary actions by allocating resources in advance and setting up preemption mechanisms before low latency services need to be transmitted. The system pre-configures resource allocation frameworks and preemption conditions, enabling rapid resource reallocation when low latency services arrive without requiring complex real-time decision-making during transmission.
Solution Approach 2:
The resource allocation system transitions from a static allocation model to a dynamic one that can adapt to changing service requirements. The access point device dynamically adjusts resource allocation based on service types and latency requirements, allowing flexible reallocation between regular services and low latency services while managing complexity through structured control mechanisms.
2Productivity
If resource preemption is used for low latency services, then transmission efficiency is improved, but system stability may deteriorate
Solution Approach 1:
The system changes key parameters such as resource allocation priorities, transmission timing, and resource allocation strategies based on service requirements. By adjusting these parameters dynamically, the system achieves high transmission efficiency for low latency services while maintaining overall system stability through controlled parameter modification rather than abrupt changes.
Solution Approach 2:
The access point device implements feedback mechanisms to monitor service transmission status and adjust resource allocation accordingly. This feedback loop ensures that resource preemption is applied only when necessary and appropriate, maintaining system stability by avoiding unnecessary interruptions to ongoing transmissions while still enabling efficient low latency service delivery.
3Loss of time
If existing TB PPDU transmission methods are used, then device complexity is low, but latency performance is insufficient
Solution Approach 1:
The transmission mechanism is segmented into distinct functional components: resource allocation module, service identification module, preemption decision module, and resource reallocation module. This segmentation allows each component to handle specific tasks independently, reducing overall system complexity while enabling sophisticated latency management through coordinated operation of these modular components.
Data Source
AI summary
Provided are a wireless communication method and a station device. The method includes that: a station device transmits a first service using a first resource when a first condition is satisfied. Herein, the first resource is a resource, allocated by an access point device, for transmitting a Physical Layer Protocol Data Unit (PPDU), and a latency requirement for data carried in the PPDU is lower than a latency requirement for the first service.