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Wireless sensor networks (WSN) consists of lightweight , low-power and small size sensor nodes (SNs). They have ability to monitor, calculate and communicate wirelessly. In this paper we present a performance evaluation of ZigBee which is IEEE 802.15.4 standard, including the Physical (PHY) layer and Media Access Control (MAC) sub-layer, which allow a(More)
Internet Control Message Protocol (ICMP) is an error reporting and diagnostic utility and it is considered as a part of Internet Protocol (IP) suite. Although this protocol is very important for ensuring correct data distribution, it can be exploited by malicious users for conducting different Denial of Service (DoS) attacks. Due to the broadcast nature of(More)
Wireless Sensor Network (WSN) is a wireless network consisting of small nodes with sensing, computation, and wireless communications capabilities. The design of wireless sensor networks depends of many factors, such as transmission errors, network topology and power consumption. Many routing protocols, protocols for data transmission, are specifically(More)
In recent times, wireless network is extensively accessed technology to connect remote user terminal with its primary network. QoS is the vital parameter that can be treated wisely when data is transferred between terminal users and network administrators. In WiMax, QoS is determined accurately at MAC layer but bandwidth allocation scheduling algorithm(More)
The quality of service (QoS) standard in Mobile Ad-hoc Networks (MANET's) is much more challenging compared to the wired networks. In the last decade there was a lot of attention in the area of integration of QoS standard in MANET protocols. QoS-based routing protocols are integral part of any QoS solution, because their function is to check whether the(More)
This paper investigates the applicability of star, tree and mesh topology schemes for large scale Wireless Sensor Network (WSN) complying with IEEE 802.15.4 standard. The main focus of this work is to evaluate the performance of such network through simulation which is carried out via the discrete event OPNET simulator (version 14.5). The performance(More)