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Journal of Sensors
Volume 2016, Article ID 7951965, 16 pages
http://dx.doi.org/10.1155/2016/7951965
Research Article

Efficient MAC Protocol for Hybrid Wireless Network with Heterogeneous Sensor Nodes

Division of Electronics and Information Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea

Received 22 July 2015; Accepted 7 February 2016

Academic Editor: Stefania Campopiano

Copyright © 2016 Md. Nasre Alam and Young-Chon Kim. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Although several Directional Medium Access Control (DMAC) protocols have been designed for use with homogeneous networks, it can take a substantial amount of time to change sensor nodes that are equipped with an omnidirectional antenna for sensor nodes with a directional antenna. Thus, we require a novel MAC protocol for use with an intermediate wireless network that consists of heterogeneous sensor nodes equipped with either an omnidirectional antenna or a directional antenna. The MAC protocols that have been designed for use in homogeneous networks are not suitable for use in a hybrid network due to deaf, hidden, and exposed nodes. Therefore, we propose a MAC protocol that exploits the characteristics of a directional antenna and can also work efficiently with omnidirectional nodes in a hybrid network. In order to address the deaf, hidden, and exposed node problems, we define RTS/CTS for the neighbor (RTSN/CTSN) and Neighbor Information (NIP) packets. The performance of the proposed MAC protocol is evaluated through a numerical analysis using a Markov model. In addition, the analytical results of the MAC protocol are verified through an OPNET simulation.