Master of Science in Electronics & Telecommunications

Permanent URI for this collectionhttp://192.248.9.226/handle/123/233

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Browsing Master of Science in Electronics & Telecommunications by Author "Samarasinghe, K"

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    item: Thesis-Abstract
    Analyzing traffic behavior and treatment in NGN IP core networks
    Karunaratne, MAIK; Samarasinghe, K
    Today Internet Protocol has taken over the entire communication. With the advancements in the new technologies cost of the IP related equipments has come down which has helped this exponential growth. with the increase of the usage the telecommunication service providers are expanding their infrastructure to cater the growth. Entire world is expanding their infrastructure mainly on IP equipments. Integrating the legacy infrastructure to the IP Network has lot of challenges. The real challenges are the transporting delay sensitive traffic like voice over the IP Network, IP node failures, IP link failure detections, delay variations. There are proprietary systems being developed between the IP vendors and the others in order to over come these challenges which can sometime be not flexible to the telecom service provider. In this research an open standard based approach is used to integrate media gateways to an IP/MPLS Network. The challenges of the integration are discussed in this thesis. A lab setup and a live network test were performed in order to measure the quality of the integration work. The interconnection methods were analyzed after going through the theories related to the media gateways and IP/MPLS technologies. Also since there. can be different type of traffic in an IP/MPLS network a traffic treatment method should also be developed The major results of the research was that using open standards methods the Essential parameters for the Media gateway integration of the IP core networks can be achieved. Also the model that was developed for the traffic treatments was successful. Media gateways interconnections with IP. networks are successful on open standards IP protocols. Fast convergence requirements, QoS requirements and jitter and delay requirements can be addressed using open standards IP protocols
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    item: Thesis-Abstract
    TCP performance evaluation in a VSAT link
    Fernando, KM; Samarasinghe, K
    The Transmission Control Protocol (TCP) is the mostly used protocol for data transmission over networks. However, TCP's congestion control algorithm wasn't created to match the special characteristics of satellite links, resulting in a drastically performance degradation. TCP appears in different algorithm versions, all with different features but with maximal throughput as their main objective. The aim of this paper is to evaluate and compare six TCP versions, which are Tahoe, Reno, New Reno, Sack, Fack, and Vegas, when applied over GEO satellite VSAT links in TCP connections, using Ns-2 simulation. Suitable scenarios based on a GEO bent-pipe satellite have been implemented. I evaluate the performance of the above mentioned TCP versions over GEO VSAT-based satellite links and compare it with the performance of a real VSAT link. It was found that the flow and congestion control mechanism used in some of TCP versions were unable to reach full utilization on VSAT link speeds.