Enabling Real-Time Quality-of-Service and Fine-Grained Aggregation for Wireless TSN

Area of Science:

• Computer Science
• Networking

Background:

• Wireless Time-Sensitive Networking (WTSN) is crucial for Industrial Internet of Things (IIoT).
• IEEE 802.11 WLAN with Time Division Multiple Access (TDMA) is a practical solution for WTSN latency.
• Existing systems face challenges in meeting strict real-time latency and reliability demands.

Purpose of the Study:

• To propose a novel protocol, RT-WiFiQA, to enhance latency and reliability in TDMA-based 802.11 systems for WTSN.
• To introduce and evaluate two key schemes: real-time quality of service (RT-QoS) and fine-grained aggregation (FGA).
• To analyze the trade-offs between reliability and aggregation in WTSN.

Main Methods:

• Development of the RT-WiFiQA protocol incorporating RT-QoS and FGA.
• RT-QoS mechanism to guarantee quality-of-service for diverse traffic.
• FGA mechanism to aggregate frames, reducing physical layer transmission overhead.
• Analysis of the reliability-FGA packet size trade-off with a derived critical threshold.
• Experimental validation using commercial off-the-shelf 802.11 interfaces.

Main Results:

• The RT-WiFiQA protocol achieves deterministic bounded real-time latency.
• Significant improvements in reliability performance compared to existing TDMA-based 802.11 systems.
• Numerical analysis identified a critical threshold for FGA effectiveness in enhancing reliability.

Conclusions:

• RT-WiFiQA effectively addresses WTSN requirements for IIoT applications.
• The proposed RT-QoS and FGA schemes provide a practical solution for low-latency, high-reliability wireless communication.
• Experimental results confirm the protocol's ability to deliver deterministic performance.