الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
This thesis investigates the enhancement of cooperative heterogeneous IoT systems based on improving the systems reliability. Since the pervasive pres- ence of IoT networks in our modern life grabs the attention of the research community to investigate ways to enhance its reliability and stability as many of these systems are considered as mission critical due to the critically of the applications it handles.Currently, several concepts are applied to enhance the systems reliability by optimizing resource utilization and providing optimal performance for dif- ferent systems especially Smart Cities. Smart Cities can be considered as one of the most vital applications presenting the concept of cooperation between heterogeneous devices. Smart Cities are cities where citizens can securely collect, manage and share information that relates to all aspects of their lives in a ubiquitous and sustainable manner. Smart Cities features permeate the lives of its citizens, a systematic failure in the infrastructure can cause in- convenience and threatens the citizens safety. Therefore, there is a desperate need to ensure reliable and trustworthy system operations.Consequently, our main objective is to enhance the reliability of IoT sys- tems supporting smart cities starting by determining the major causes of IoT systems failure. Based on our investigations, two solutions will be presented to decrease the probability of the systems failure on the networked application and the wireless communication levels of the IoT operations stack. At the wireless communication level: we proposed a model with the concept of Smart Cities in mind. In Smart Cities IoT Gateways can be a bottleneck and a single point of failure. Gateways manage all the traffic flowing from the sensors to the back-end cloud. In this thesis we propose an optimized auto- mated workload migration mechanism between closely adhoc mobile Gateways to enhance the mission critical IoT networks reliability and efficiency.At the networked application level, disaster management system will be presented in Smart Cities as a case study with the objective of enhancing the systems reliability and security. Since the current disaster management solu- tions operate on a centralized servers processing vast amount of information about the disaster locations to guide help provisioning in the targeted areas. These systems assume full time availability of WAN scale network infrastruc- ture and continuous access to such servers. Such assumption might not be valid when it comes to largescale natural or man-made disasters affecting the WAN network coverage, or destroying such servers. Natural disasters such as tsunamis, earthquakes and hurricanes pose se- vere economic damages and threaten the citizens safety. Consequently, disas- ter management is essential to develop an effective disaster response. In this thesis, a novel infrastructureless based, decentralized, disaster management solution with no WAN coverage will be presented. The presented solution relies on Blockchain technology to establish a set of loosely coupled ad hoc networks to facilitate data exchange between peers operating in the disas- ter areas. The system uses the available computational resources within the network to construct an ad hoc cloud hosting a set of containerized disaster management applications.