A survey on Quality of Service (QoS) methods for real-time and mission-critical applications

Quality of Service (QoS) for real-time and mission-critical applications represents the most sophisticated implementation of network prioritization technologies, ensuring reliable communication when milliseconds matter. This article explores advanced QoS mechanisms including ultra-precise traffic classification through deep packet inspection, specialized scheduling algorithms like Strict Priority Queuing and Low Latency Queuing, advanced buffer management techniques including Priority-Based Flow Control, and redundancy strategies incorporating packet duplication and AI-powered monitoring. These technologies work together to deliver deterministic network performance across critical sectors such as healthcare, industrial control systems, public safety networks, air traffic control, power grid management, military communications, and financial trading infrastructure. As digital transformation extends to increasingly critical functions, these QoS implementations become essential rather than optional, ensuring network performance remains reliable regardless of surrounding conditions.