A Joint Model for IEEE 802.15.4 Physical and Medium Access Control Layers

TL;DR

This paper presents a comprehensive joint model of the IEEE 802.15.4 PHY and MAC layers, combining mathematical and Markov chain approaches to better predict network performance and identify failures.

Contribution

It introduces a novel combined model for PHY and MAC layers of IEEE 802.15.4, improving accuracy over previous models and enabling detailed performance analysis.

Findings

Model accurately mimics IEEE 802.15.4 functionalities

Enhanced predictions of network reliability and delay

Better detection of potential failures at both layers

Abstract

Many studies have tried to evaluate wireless networks and especially the IEEE 802.15.4 standard. Hence, several papers have aimed to describe the functionalities of the physical (PHY) and medium access control (MAC) layers. They have highlighted some characteristics with experimental results and/or have attempted to reproduce them using theoretical models. In this paper, we use the first way to better understand IEEE 802.15.4 standard. Indeed, we provide a comprehensive model, able more faithfully to mimic the functionalities of this standard at the PHY and MAC layers. We propose a combination of two relevant models for the two layers. The PHY layer behavior is reproduced by a mathematical framework, which is based on radio and channel models, in order to quantify link reliability. On the other hand, the MAC layer is mimed by an enhanced Markov chain. The results show the pertinence of our approach compared to the model based on a Markov chain for IEEE 802.15.4 MAC layer. This contribution allows us fully and more precisely to estimate the network performance with different network sizes, as well as different metrics such as node reliability and delay. Our contribution enables us to catch possible failures at both layers.