Kablosuz tasarsız ağlar için bir eşler arası dosya paylaşım sistemi

ABSTRACTA PEER-TO-PEER FILE SHARING SYSTEM FORWIRELESS AD-HOC NETWORKSHasan SüzeroM.S. in Computer Engineering˙Supervisor: Assist. Prof. Dr. Ibrahim Kürpeoğluo gAugust, 2004In recent years, we have witnessed an increasing popularity of peer-to-peer (P2P)networks. Especially, file sharing applications aroused considerable interest of theInternet users and currently there exist several peer-to-peer file sharing systemsthat are functional on the Internet.In the mean time, recent developments in mobile devices and wireless commu-nication technologies enabled personal digital assistants (PDA) to form ad-hocnetworks in an easy and automated way. However, file sharing in wireless ad-hocnetworks imposes many challenges that make conventional peer-to-peer systemsoperating on wire-line networks (i.e. Internet) inapplicable for this case. Informa-tion and workload distribution as well as routing are major problems for membersof a wireless ad-hoc network, which are only aware of peers that are within theircommunication range.In this thesis, we propose a system that solves peer-to-peer file-sharing prob-lem for wireless ad-hoc networks. Our system works according to principles ofpeer-to-peer systems, without requiring a central server, and distributes informa-tion regarding the location of shared files among members of the network. Bymeans of constructing a distributed hash table (DHT) and forming a tree shapedoverlay network based on the topology of the network itself, the system is able toanswer location queries, and also discover and maintain routing information thatis used to transfer files from a source-peer to another peer.Keywords: Wireless Ad-Hoc Networks, File Sharing, Peer-to-Peer Networks.iii