Hussein G. Badr

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Today's universal communications increasingly involve mobile and battery-powered devices (e.g. hand-held, laptop) over wired and wireless networks. Energy efficiency, as well as throughput, are becoming service characteristics of dominant importance in communication protocols. Although standard TCP versions lack the functionality to efficiently adjust their(More)
— Segment retransmissions are an essential tool in assuring reliable end-to-end communication in the Internet. Their crucial role in TCP design and operation has been studied extensively , in particular with respect to identifying non-conformant, buggy, or underperforming behaviour. However, TCP segment retransmissions are often overlooked when examining(More)
Today's universal communications increasingly involve mobile and battery-powered devices (e.g. hand-held, laptop, IP-phone) over wired and wireless networks. Energy efficiency, as well as throughput, are becoming service characteristics of dominant importance in communication protocols. The wide applicability of IP-networks/devices, and the wide range of(More)
This work involves the development of an experimental transport-level protocol running on top of IP for small, mobile, wireless stations. The protocol cannot and does not aim to handle real-time traffic. Its central concern is to conserve battery-powered energy used for transmission, even at the expense of slower data throughput. It attempts to conserve(More)
— TCP performance evaluation studies need to use protocol configurations representative of real networks. However, the actual deployment of TCP options has not yet been quantified on a large scale. After analyzing a large set of traffic traces collected at 12 different monitoring points, we find that TCP segment sizes have a bimodal distribution, not a(More)
Explicit Congestion Notification (ECN) for IP networks has received considerable attention in recent years, and has been shown to improve TCP goodput. Previous studies have centered on scenarios in which TCP with ECN (TCP/ECN) traffic competes with ECN-unaware traffic. This paper presents case studies in which moderately short flows are all ECN-capable, and(More)
This work addresses the problem of real time network resource management. Resources are represented as Resource Virtual Machines, which exhibit similar characteristics as actual resources with respect to service time, QOS ooered, frequency of breakdowns, cost of each service ooered, response latency, etc. The architecture is based on distributed computing(More)