Wi-Fi Stream Classification for Low-Latency Preemptive Traffic
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Solution Overview
Problem
Existing Wi-Fi standards lack mechanisms for signaling low latency and preemption requirements for event-based traffic flows, which are crucial for supporting applications like cloud gaming and industrial IoT.
Innovation Solution
Implementing a Stream Classification Service (SCS) that allows endpoints to register low latency and preemption requirements for event-based traffic, using enhanced Quality of Service (QoS) elements to manage traffic flows and support preemption capabilities in Wi-Fi networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing Wi-Fi standards are used without enhancements, then device compatibility is maintained, but low latency and preemption requirements for event-based traffic cannot be signaled
Solution Approach 1:
The patent embeds preemption capability indicators and low latency requirements within existing Stream Classification Service (SCS) request/response frames and QoS elements. By nesting these new requirements inside existing Wi-Fi protocol structures, the patent enables enhanced functionality without requiring separate signaling protocols, thus improving reliability while minimizing additional complexity
Solution Approach 2:
The patent enables endpoints to register preemption requirements and low latency needs in advance through SCS requests before actual traffic flows begin. This preliminary registration allows the access point to pre-configure QoS parameters and preemption capabilities, ensuring reliable low latency communication when event-based traffic actually occurs without adding complex real-time signaling
2Loss of time
If preemption capabilities are added to support event-based traffic, then latency is reduced to 1 ms, but the QoS element structure becomes more complex
Solution Approach 1:
The patent segments QoS requirements into distinct components: standard QoS parameters and new preemption capability indicators. By separating these concerns within the QoS element structure, the patent enables targeted enhancement for latency-critical functions while maintaining the原有 QoS framework, achieving 1 ms latency without completely redesigning the QoS system
Solution Approach 2:
The patent adds only the minimum necessary preemption capability indicators to QoS elements rather than completely redesigning the QoS structure. This partial enhancement approach provides sufficient functionality for low latency event-based traffic while avoiding excessive complexity in the QoS element structure
3Productivity
If Stream Classification Service is enhanced with preemption requirements, then event-based traffic gets priority treatment, but processing overhead at the access point increases
Solution Approach 1:
The patent enables endpoints to register preemption requirements and traffic characteristics in advance through SCS requests. The access point processes these registration requests beforehand to configure QoS policies and preemption capabilities, rather than making complex decisions in real-time during traffic transmission. This preliminary configuration reduces processing overhead during actual event-based traffic handling while maintaining high productivity
Data Source
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AI summary
Aspects of the present disclosure are directed to receiving, at an access point (AP) from an endpoint, a stream classification service (SCS) request. The SCS request identifies one or more of QoS characteristics and preemption requirements for a traffic flow originating from the endpoint. The method includes determining, by the AP and based on a policy, whether the AP can accept the SCS request for the traffic flow, and transmitting, by the AP and to the endpoint, an SCS response indicating whether the AP can accept the SCS request for the traffic flow or not.