Omar Said

A Novel Framework for Guaranteeing Quality of Service in Wireless Sensor Networks: Design, Simulation and Evaluation

Wireless Sensor Networks (WSN) became one of the most important areas of research in the world. The Quality of Services (QoS) is the cornerstone of WSN efficiency due to providing the network with all requirements for efficient sending and receiving of data. Because of WSN different infrastructures, there are different QoS parameters required for this environment. In this paper, a general framework to guarantee the WSN QoS is proposed. The proposed framework aims to produce a standard solution for WSN QoS problems. How to solve the problems of traditional protocols, taking into account the compatibility, which may result from a collection of individual solutions in one general framework, is the paper target. Also, the proposed framework adds new strategies like congestion prediction and network management technologies to outperform the previous solutions. Finally, our framework is simulated using network simulation package (NS2) and compared with individual solutions to make sure that it is more robust and efficient, which leads us to standardization.

Design and performance evaluation of mixed multicast architecture for internet of things environment

Internet of things (IoT) has become one of the most important fields in computing arena. The environments of IoT require highly efficient, immediate and worldwide communication services. Accordingly, efficient multicast routing architecture is a fundamental premise for IoT. This paper proposes a mixed multicast architecture for IoT environments that employs the centric, hierarchical, and distributed traditional multicast architectures. The aim is to determine the most suitable traditional multicast architecture, relative to the current state of the IoT system. First, an algorithm to manage the proposed multicast architecture is introduced. Then, an IoT case study for each traditional multicast architecture is demonstrated. Finally, a simulation environment is established, using the network simulator package NS2, to measure the performance of the proposed architecture. The considered performance metrics are end-to-end delay, packet loss, throughput, energy consumption, and transformation rate between traditional multicast architectures. The results demonstrate the superiority of the proposed architecture relative to individual traditional multicast architectures.

Performance Evaluation of a Dual Coverage System for Internet of Things Environments

A dual coverage system for Internet of Things (IoT) environments is introduced. This system is used to connect IoT nodes regardless of their locations. The proposed system has three different architectures, which are based on satellites and High Altitude Platforms (HAPs). In case of Internet coverage problems, the Internet coverage will be replaced with the Satellite/HAP network coverage under specific restrictions such as loss and delay. According to IoT requirements, the proposed architectures should include multiple levels of satellites or HAPs, or a combination of both, to cover the global Internet things. It was shown that the Satellite/HAP/HAP/Things architecture provides the largest coverage area. A network simulation package, NS2, was used to test the performance of the proposed multilevel architectures. The results indicated that the HAP/HAP/Things architecture has the best end-to-end delay, packet loss, throughput, energy consumption, and handover.

A Novel Technique to improve the Performance of Wireless Sensor Network using Adaptive Antennas and High-Altitude Platform Communications

this paper, the performance of Wireless Sensor Networks (WSN) is improved using adaptive antenna technique and High-Altitude Platforms Systems (HAP). An adaptive concentric circular array (ACCA) is proposed to improve the communications link between sink and sensor nodes. The system is first demonstrated for several scenarios including different cell sizes at a HAP height of 20 km and the quality of link in terms of the ratio of bit energy to noise power is demonstrated where it shows the capability and reliability of building HAP-WSN despite of the long distance between ground sensors and HAP sink. The proposed ACCA technique provides a power gain profile that both increases the power to and from sensor nodes as well as it reduces the out-of cell radiation to other HAP-WSN areas.