Abstract
This paper proposes a dynamic priority system at medium access control (MAC) layer to schedule time sensitive and critical communications in infrastructure-less wireless networks. Two schemes, priority enabled MAC (PE-MAC) and optimized PE-MAC are proposed to ensure real-time and reliable data delivery in emergency and feedback systems. These schemes use a dynamic priority mechanism to offer improved network reliability and timely communication for critical nodes. Both schemes offer a notable improvement in comparison to the IEEE 802.15.4e low-latency deterministic networks. To ensure more predictable communication reliability, two reliability centric schemes, quality-ensured scheme (QES) and priority integrated QES, are also proposed. These schemes maintain a pre-specified successful packet delivery rate, hence improving the overall network reliability and guaranteed channel access.
Highlights
INTRODUCTIONRadio communications technology has notably improved. The static communication systems have transformed into dynamic self-governing networks capable of anticipating and addressing network anomalies in real-time [1]
Over the years, radio communications technology has notably improved
A dynamic priority system is proposed based on three important aspects of industrial processes: i) the critical nature of the sensed data; ii) weight of the underlying process/control system depending on its importance; and iii) channel condition and deadline based information rescheduling
Summary
Radio communications technology has notably improved. The static communication systems have transformed into dynamic self-governing networks capable of anticipating and addressing network anomalies in real-time [1]. Data traffic in industrial networks can be divided into multiple categories based on the critical nature of the information and can have heterogeneous time deadlines This fact can be used to improve the performance of IWSNs by increasing the reliability of high priority information and to ensure the timely delivery of critical data. To improve the coexistence of traffic with different priorities, two priority enabled MAC schemes, PE-MAC and O-PEMAC are proposed These schemes allow real-time and reliable communication of critical information within the emergency, regulatory and supervisory control systems. A dynamic priority system is proposed based on three important aspects of industrial processes: i) the critical nature of the sensed data; ii) weight of the underlying process/control system depending on its importance; and iii) channel condition and deadline based information rescheduling.
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