No abstract

Özetçe-Bu bildiride, tampon harita değişim periyodunun ve düğümlerin sahip olduğu ortak sayısının görevdeş ağlarda bir itme/çekme tabanlı canlı video akışlandırma uygulaması üzerindeki etkisi ortaya konmuştur. Oluşturulan uygulama, network simulator-3 simülasyon ortamı kullanılarak gerçeklenmiş ve ilgili parametrelerin video akışlandırma performansı üzerindeki etkisi gerçekleştirilen deneylerle gösterilmiştir. Sonuçlar göstermektedir ki, tampon harita değişim periyodu sabit tutulduğunda düğümlerin sahip olduğu ortak sayısının artışıyla birlikte izlenen video kalitesi ve kontrol mesajlarının maliyeti artmaktadır. Öte yandan, düğümlerin sahip olduğu ortak sayısı sabit tutulduğunda kontrol mesaj maliyetinin ve video kalitesinin optimale yakın olduğu bir tampon harita değişim periyodu bulunabilmektedir. Anahtar Kelimeler-video akışlandırma; görevdeş ağlar; itme/çekme tabanlı video akışlandırma uygulamaları; ortak sayısı; tampon haritası değişim periyoduAbstract-In this paper, the impact of both the buffermap exchange period and partnership size of peers has been presented in a push/pull-based peer-to-peer (P2P) live video streaming application. The application has been implemented on network simulator-3 and the impact of aforementioned parameters on video streaming performance has been introduced via the simulation test results. The test results show that if the buffermap exchange period is fixed, received video quality and the control overhead increase with the increment in partnership size. On the other hand, if the partnership size of the nodes is fixed, a buffermap exchange period can be found for near-optimal video quality and control overhead. Keywords-video streaming; peer-to-peer networks; push/pull-based video streaming applications; number of partners; buffermap exchange period

No abstract

Peer-to-peer (P2P) video streaming systems enable video data exchange between peers by reducing the overload of the servers while utilising network resources. Multi-agent systems (MASs), including many autonomous and intelligent software agents working on behalf of video peers, may also provide a feasible infrastructure for the implementation of P2P video streaming systems. Within this context, research on the use of software agents in video streaming systems has recently emerged. In this study, the authors discuss the development of an agent-based P2P video streaming system. Software engineering of the MAS with covering various aspects such as agent internals and interactions in the system is described. Performance evaluation of the proposed agent-based P2P system comparing with the popular in-use streaming application is also reported. Results show that a well-defined behaviour of a parent selection software agent can improve the continuity index in P2P video streaming systems. Therefore the users in the system can watch video in a better quality and lower end-toend delay comparing with the currently used video streaming applications. They also examine that peer welcoming (traffic localisation) behaviour of the agents decreases the internal Internet service provider traffic significantly.

Research on the use of software agents in P2P video streaming systems has recently emerged in order to meet the requirements such as time constraints, minimizing delay and efficient utilization of network resources. However parent selection and network awareness are not addressed properly in these leading studies. In order to fill this gap, we introduce the design and implementation of a Multi-agent System (MAS) for P2P video streaming in this paper. The construction of the MAS by applying a well-defined agent-oriented software engineering methodology is discussed. The internal structure of each agent in the proposed MAS is based on the well-known Belief-Desire-Intention (BDI) architecture. Experimental results show that the proposed MAS succeeds the related parent selection and promotes the system execution. BDI-based MAS design given in this paper can guide those researchers who aim to implement autonomous mesh-based P2P video streaming systems. Keywords-agent; multi-agent system (MAS); belief-desireintention (BDI); peer-to-peer (P2P); video streaming.I.