Despina Triantafyllidou

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We present an optimized scalable simulation model for TCP, developed in OPNET, and investigate its performance in the case of OLSR mobile ad-hoc networks (MANETs). The key idea for the model's construction is to represent each node by a subqueue, in the simulation model. Thus, the exchange of packets in the network is literally a set of enqueue/dequeue(More)
In the present work we examine the impact of average path-delay routing (APDR) to TCP, in 802.11 ad hoc networks. The route discovery is based on the lowest average-delay path, and on optimised link state routing (OLSR). The simulation study on ad hoc scenarios reveals an improved roundtrip time (RTT) for TCP, but a reduced throughput. As shown, regular(More)
An emerging approach for improving the performance of TCP in ad hoc multihop networks is to limit the maximum congestion window (CWNDmax) that a TCP connection is allowed to reach, in order to eliminate the number of outstanding segments and increase the TCP stability. In the present work, we propose an adaptive scheme to bound the CWNDmax value in an IEEE(More)
We propose a novel regressive principle to Admission Control (AC) assisted by real-time passive QoS monitoring. This measurement-based AC scheme accepts flows by default, but based on the changes in the network QoS, it makes regressive decisions on the possible flow rejection, thus bringing cognition to the network path. The REgressive Admission Control(More)
In this paper we propose an approach to increase TCP’s fairness in multihop wireless networks, using ECN as a congestion signalling mechanism. The novel idea we introduce is that the marking probability at a wireless node is a function of the aggregate utilization in the node’s neighborhood, which is determined by the sum of the receiving rates of all nodes(More)
We present a new approach for seamless congestion control over heterogeneous networks containing wired and wireless IEEE 802.11 links. The approach uses ECN (Explicit Congestion Notification) as a common signalling mechanism for conveying congestion information from both wired and wireless links. Two additional novel aspects of the approach are that ECN(More)
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