Said Zaghloul

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The rapid increase of the number of mobile subscribers as well as the deployment of 3G technologies are putting strain on mobile backhaul operational expenditures (OPEX) which amount to 20-40% of total mobile operator’s OPEX due to their reliance on T1/E1 copper lines. For these reasons, the current backhaul systems, a term commonly used to describe(More)
Recent advances in wireless all-IP telecommunications made it possible for the operators to offer more sophisticated services with mixtures of high quality audio, video, data, and interactive applications. However, mobility still poses a challenge for quality of service (QoS) maintenance in such networks as it typically causes large signaling delays which(More)
Significant research and standardization efforts are underway to enable automated computation and reservation of connection-oriented paths (circuits) across multiple domains. In the absence of a secure authentication and authorization mechanism, however, carriers continue to provision connections manually, which leads to large setup delays and increases(More)
Authentication, Authorization, and Accounting (AAA) deployments are expected to grow significantly in emerging mobile systems as they offer a plethora of services and mobile applications. In current systems, network access servers (NAS) periodically report the service usage of mobile users located within their coverage areas. The periodic reports are used(More)
The modeling of TCP transfer latency has received significant attention in the last decade. Several models have been proposed for TCP performance under various conditions. All the available models predict TCP performance for a single link. Furthermore, all models relate timeouts to packet drops either due to congestion or due to transmission errors.(More)