Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Multi-Copy Routing for Delay Tolerant Networks in Iztech(Izmir Institute of Technology, 2017) Dusenge, Babrah; Atakan, BarışDelay Tolerant Networks (DTNs) are approaches of communication that seeks to address the technical issues in intermittent networks that may lack continuous network connectivity between source and destination for message transmission. In these kinds of networks, opportunistic routing algorithms are needed, where the destination is reached through intermediate mobile nodes by use of store-carry-and-forward strategy. In this thesis, Binary Spray and Wait with Routine Awareness (BSWRA) is proposed in IZTECH. IZTECH is divided into five sub-areas (EEE department, Library, Cafeteria, Gym and Dormitory) with respect to their routine working hours. In our proposed protocol, the working time frame of IZTECH is our main interest which we refer as Routine Awareness (stipulated time frame). The Routine Awareness is added to Binary Spray and Wait (BSW) to increase chances of finding destination node. The proposed protocol improves BSW protocol on delay problem, by treating a node within a new sub-area as a source node. Furthermore, this work addresses the overhead issue in DTN protocols by revising the effect of dropping repeated messages within a sub-area. BSWRA protocol has been implemented and performance analysis has been carried out using NS2 simulator. This work examines the performance of BSWRA with popular DTN protocols (i.e. BSW, ER and PRoPHET Protocols) in terms of message delivery ratio, average end-to-end delay and overhead ratio, by observing the performance parameters of all routing protocols under varying number of nodes, message size and buffer size. The simulation results shows that generally, BSWRA protocol provides a better performance, though with 100 number of nodes and buffer size equal to100MB, ER protocol outperforms all the protocols in terms of average end-to-end delay but with the worst delivery ratio and overhead ratio.Master Thesis Rounting and Resource Allocation for Software Defined Mobile Networks(Izmir Institute of Technology, 2016) Aydoğmuş, Yiğitcan; Özbek, BernaSince traffic diversity and volume increase with growing popularity of mobile applications, there is the strong need to manage the traffic carried by networks. Software defined networks can simplify network management while enabling new services by employing traffic management including routing whose goal is to maximize the given utility while satisfying capacity requirements. Another key concept to meet up huge data traffic is cloud-based radio access networks. By integrating cloud services to radio access networks, operators will make use of network functions virtualization which allows to host different virtualized functions on a common hardware platform. In this thesis, an efficient routing algorithm is proposed to minimize the cost based on power consumption determined by the number of active OpenFlow switches and active links in a software defined networks while satisfying throughput requirements of all flows according to constraints on link capacities in the software defined mobile network. The algorithm is also implemented in mobile network by combining resource allocation in a cloud radio access network. The performance of the proposed algorithm is evaluated based on power consumption efficiency for different network topologies with various scenarios.