Mobility Overhead in IEEE 802.15.4e Low Latency Deterministic Networks

Abstract

IEEE 802.15.4 standard has a limited capacity to ensure low latency for time-critical industrial applications. The IEEE 802.15.4e LLDN mode has been specifically designed for industrial applications requiring low latency and round trip time. One of the main characteristics of LLDN regards the support of device mobility. The mobile devices aiming at association with the PAN coordinator are discovered and configured during discovery and configuration states. These states are isolated from the online state during which transmission of regular readings occurs. As discovery state, configuration state and online state utilize a shared single channel, a long association time at discovery and configuration states leads to a long delay for data transmission in online state, and vice versa. In this paper, we propose a modified superframe structure for fast discovery of mobile devices. Our goal is to minimize association latency for new devices by reducing the latency to enter into the online state. We show the efficiency of our proposed superframe structure compared with the default LLDN via our analysis.

Modeling and analysis of priority and range‐based‐deterministic and synchronous multichannel extension‐guaranteed time slot allocation in IEEE 802.15.4e medium access control protocol

“…However, the LLDN MAC scheme supports only star topology networks. 5,6 Next, the TSCH MAC scheme is well suited for process automation in industries. 7,8 Moreover, the TSCH MAC scheme supports many autonomous scheduling methods to enhance the reliability of the networks.…”