Ahmed Said Abdelsalam

• PhD
• Quality Assurance Specialist at ST Engineering iDirect

DVB-S/S2 is used to provide multimedia broadcasting and unidirectional IP based services over satellite networks, while DVB-RCS enhances transmission in a bidirectional way, enabling transmission over the satellite return channel. Streaming Encapsulation (GSE) protocols are defined to transport 'P datagrams over DVB. They provide several benefits o...

TCP Wave relies on a disruptive communication paradigm based on bursts, to overcome limitations of legacy TCP with modern applications and challenging network scenarios. This protocol was already validated with appealing results via simulations. This work now presents its implementation in the Linux kernel, focusing on the adaptations needed to dea...

TCP Wave relies on a disruptive communication paradigm based on bursts, to overcome limitations of legacy TCP with modern applications and challenging network scenarios. This protocol was already validated with appealing results via simulations. This work now presents its implementation in the Linux kernel, focusing on the adaptations needed to dea...

Video streaming today shows a widespread success, representing already the greatest portion of the Internet's IP traffic. The most common approach in today's networks is to adopt HTTP-based solutions, such as the Dynamic Adaptive Streaming over HTTP (DASH) protocol. This choice allows using general purpose web clients (web browsers) to access video...

We present the design and implementation aspects of a virtualized Performance Enhancing Proxy (vPEP), achieving performance optimizations in a 5G compliant architecture involving the satellite as an alternate, additional backhaul link. The deployment of hybrid terrestrial-satellite configurations is realized through the vPEP agent, meant as a chain...

In the definition of advanced 5G scenarios, one of the possible configurations including the satellite link is to consider it to provide a supplementary capacity to enhance backhauling towards data networks. The peculiar satellite physical characteristics and the resulting challenging communication environment (i.e., large propagation delays, possi...

Video streaming is nowadays the dominant Internet application contributing to most of the generated IP traffic. In the 5G era, network slicing and dynamic management can lead to link changes due to handover for offloading and/or optimization purposes, making bottleneck bandwidth and experienced latency varying over time. In this framework, sat...

The availability of multiple technologies to access the Internet is even more common in today's connectivity scenarios. As an example, smartphones make use of 3G/4G data technology but, when a Wi‐Fi access point is available, they switch from 3G/4G (which typically is a paid per volume service) to the wireless local access. The same principle is ap...

Internet access is becoming even more heterogeneous, including different wireless backhauling links, with Ka-band satellites as a possible alternative. Since communication path is unknown a priori, adoption of PEP solutions to optimize TCP performance over satellite is discouraged to allow dynamic network reconfigurations. To opposite, an end-to-en...

The rapid evolution of the Web imposes the need of enhancing the HTTP over satellite channels. To this aim, SPDY is a protocol engineered to reduce download times of content rich pages, as well as for managing links characterized by large Round Trip Times (RTTs) and high packet losses. With such features, it could be an efficient solution to cope w...

In case of hybrid access networks, the selected link can suddenly change leading to a vertical handover. A running TCP connection can experience a combination of three potential effects: a bandwidth change, a latency change and an outage interval due to handover operations. In this context, we address a detailed performance analysis of standard TCP...

Satellites represent a solution for Internet access in locations with no other telecom infrastructures, for example, on high mobility platforms such as planes, ships or high-speed trains, or for disaster recovery applications. However, due to peculiar characteristics, satellite networks are prone to different security threats. In this paper, we int...

The goal of this work was to understand the direction of the emerging web technologies and to evaluate their expected impact on satellite networking. Different aspects have been analysed using both real satellite testbeds and emulation platforms in different test sites in Europe. This analysis included an evaluation of those HTTP/2.0 specifications...

The Satellites represent a solution for Internet connectivity and data distribution in isolated locations, on high mobility platforms such as planes, ships or high-speed trains or for disaster recovery applications. However, due to the characteristics of the satellite systems, the data transmission over the satellite networks must face some challen...

The rapid evolution of the Web imposes the need of enhancing the HTTP over satellite channels. To this aim, SPDY is a protocol engineered to reduce download times of content rich pages, as well as for managing links characterized by large Round Trip Times (RTTs) and high packet losses. With such features, it could be an efficient solution to cope w...

SPDY is a new application technology, introduced by Google, to accelerate Web transfers over common internet links. Most of the SPDY techniques (i.e. header compression, pushing and multiplexing) are usually included in satellite Performance Enhancing Proxies (PEPs) to optimize performance. Therefore, SPDY over satellite is expected to improve perf...

SPDY is a recent Web technology aimed to improve webpages load time, and thus resource use optimization, through the implementation of: multiplexing and prioritization of webpage objects, header compression, resource pushing and encryption. Most of these techniques are already implemented in Performance Enhancing Proxies (PEPs), which are adopted i...

SPDY is a recent Web technology aimed to drastically improve web page load time. Its application on the common terrestrial networks allows expected benefits through a set of methods: multiplexing and priority of webpage objects, header compression, pushing and encryption. Currently, a performance assessment of SPDY over satellite is not available....

The demand on mobile phones has increased globally, and their functionality may even rival desktop computers despite of their smaller sizes. This extraordinary design of mobile phones makes them easy to use in our daily life performing many tasks other than just sending and receiving phone calls. Mobile phones now are capable of texting, web browsi...