Wireless AP Coordination for Low-Latency RU Protection
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Solution Overview
Problem
Existing wireless networks face challenges in protecting dedicated resource units (RUs) for low-latency traffic from being occupied by other stations (OBSS STAs) due to synchronization issues and energy detection, leading to increased latency in real-time applications.
Innovation Solution
A mechanism is introduced where a coordinating AP transmits request and response frames to coordinate with other APs and STAs to reserve and protect RUs for low-latency traffic, using frames like the Stream Classification Service (SCS) request and response frames, and Network Allocation Vector (NAV) to ensure dedicated RUs are not used by other devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If energy detection and synchronization mechanisms are used to allocate resource units, then channel access efficiency is improved, but dedicated RUs for low-latency traffic cannot be protected from occupation by OBSS STAs
Solution Approach 1:
The coordinating AP sends a first request frame to the second AP before the low-latency traffic transmission begins, reserving the first RU in advance for the duration of the low-latency transmission. This preliminary reservation prevents OBSS STAs from occupying the dedicated RU, ensuring that the resource unit is protected before the actual data transmission starts.
2Productivity
If multi-link operation (MLO) is implemented to increase throughput, then data rate is improved, but coordination between multiple APs becomes more complex
Solution Approach 1:
The patent introduces a coordinating AP that acts as an intermediary to manage resource unit reservations across multiple APs. The coordinating AP sends request frames to other APs (second AP) and receives response frames, centralizing the coordination logic. This mediator approach simplifies the overall system complexity by providing a single point of control for inter-AP coordination in MLO networks.
3Loss of time
If RUs are reserved for low-latency traffic, then latency is reduced, but other STAs cannot access these RUs even when not transmitting low-latency traffic
Solution Approach 1:
The resource unit reservation is dynamic and time-bound. The first request frame includes a duration parameter that specifies how long the first RU should be reserved. After this duration expires, the reservation is automatically released and the RU becomes available for general use by other STAs. This dynamic approach ensures that RUs are protected only when needed for low-latency traffic, maintaining high network utilization during periods when low-latency traffic is not active.
Data Source
AI summary
A first access point (AP) for facilitating communication in a wireless network. The first AP receives, from a second AP, a first request frame requesting coordination so that the first AP and one or more stations (STAs) in a basic service set (BSS) of the first AP avoid using a first resource unit (RU), wherein the first RU is dedicated for low-latency traffic transmission and the first request frame includes a first duration for the coordination. The first AP transmits, to the second AP, a first response frame accepting the request of the first request frame.