Raid Zaghal

Jitter and delay reduction for time sensitive elastic traffic for TCP-interactive based world wide video streaming over ABone

Interactivity in transport protocol can greatly benefit transport friendly applications generating streaming traffic. Recently we have developed the TCP interactive, which can provide event notification to the subscriber of its communication service. This is operationally state equivalent to the conventional TCP except applications can optionally subscribe, receive, and in real-time react to selected local end-point events. This simple extension opens the horizon for a spectrum of smart application level solutions to be realized for many of the current hard problems including congestion control for time sensitive elastic traffic. We have recently implemented and tested the real system on the active network (ABone) testbed for video streaming to worldwide sites. In this paper we share the performance of this system and report potential dramatic improvement in time-bounded streaming traffic.

Symbiotic streaming of elastic traffic on interactive transport

Interactivity in transport protocol can greatly benefit transport friendly applications. We envision if a transport mechanism, which is interactive and can provide event notification about network state to the subscriber of its communication service, than a wide range of solution to many of todays hard network problem can be instituted. Recently we have implemented this concept system as a new TCP kernel on FreeBSD called TCP interactive and a novel symbiotic MPEG-2 full logic transcoder. In this paper we share the results of the TCP interactive performance experiment and show potential dramatic improvement in time-bounded video delivery.

Symbiotic rate adaptation for time sensitive elastic traffic with interactive transport

Interactivity in the transport protocol can greatly benefit transport friendly applications generating streaming traffic. Recently we have developed iTCP, which can provide event notification to the subscriber of its communication service. This is operationally state equivalent to the conventional TCP except applications can optionally subscribe, receive, and in real-time react to selected local end-point events. This simple extension opens the horizon for a spectrum of smart application level solutions to be realized for many of the current hard problems. In this paper we demonstrate a new paradigm of congestion management for time sensitive elastic traffic. Based on the transport layer feedback, a rate adaptation mechanism kicks in. This mechanism provides a generation rate control with guaranteed TCP buffer delay. We have recently implemented and tested the real system on the Active Network (ABone) testbed for video streaming to worldwide sites. In this paper we share the performance of this system and report observed dramatic improvements in time-bounded streaming traffic.

A Comparison between EJB and COM+ Business Components, Case Study: Response Time and Scalability

Most distributed system architectures are designed as a three-tier systems consisting of a thin-client, middleware and a database. The overall performance of such systems depends on the performance of each tier individually and the overhead incurred by the collaboration between these three tiers. Nowadays, the two most popular middleware systems are: Microsoft’s .NET platform and Sun’s Java 2 Enterprise Edition (J2EE) platform. In J2EE, the middle tier infrastructure is called Enterprise JavaBeans (EJB) and in the .NET framework, it is called Component-Oriented Middle-Tier (COM+). Usually, the middle tier provides the business logic (any code that is not specifically related to storing and retrieving data, or formatting data for display to the user) and the performance of this tier is crucial to the overall performance of the distributed system.

High performance mobility without agent infrastructure for connection oriented service

Currently it is very difficult for connection oriented applications to use a mobile environment. One reason is that Mobile IP requires intermediate software agents to be deployed in the Internet. This infrastructure based mobility scheme offers connectivity to itinerant hosts but incurs significant handoff and tunneling delays along with deployment costs. These delays are particularly harmful for connection oriented applications. In this paper we investigate an alternate mobility scheme which does not require any such infrastructure but only uses an end-point technique and interestingly provides much faster loss-free handoff for connection oriented applications. This End-to-End scheme named Interactive Protocol for Mobile Networks (IPMN) intelligently performs handoff based on information provided by MAC Layer. The network address change is handled by renewing the existing connections by manipulating the TCP/IP stack at the end-points. Also, unlike several other recently proposed end-to-end techniques which require extensive modification of end-protocols, the proposed scheme does not require any functional change in the TCP/IP protocol software. Besides the difference in deployment scenarios, the IPMN offers blazingly fast event based handoff and much faster and simplified transport (no tunneling delay) than MIP. We have implemented IPMN over FreeBSD. In this paper we show the performance advantage of IPMN over MIP with real deployment for three interesting real-time traffic types - www, voice streaming and, steerable/interactive time critical video.

Extending AES with DH Key-Exchange to Enhance VoIP Encryption in Mobile Networks

Due to the huge developments in mobile and smartphone technologies in recent years, more attention is given to voice data transmission such as VoIP (Voice over IP) technologies, e.g., (WhatsApp, Skype, and Face Book Messenger). When using VoIP services over smartphones, there are always security and privacy concerns like the eavesdropping of calls between the communicating parties. Therefore, there is a pressing need to address these risks by enhancing the security level and encryption methods. In this work, we suggest a new scheme to encrypt VoIP channels using (128, 192 & 256-bit) enhanced encryption based on the Advanced Encryption Standard (AES) algorithm, by extending it with the well-known Diffie-Hellman (DH) key exchange method. We have performed a series of real tests on the enhanced (AES/DH) algorithm and compared its performance with the generic AES algorithm. The results have shown that we can get a significant increase in the encryption strength at a very small overhead between 4% and 7% of execution time.

DILH: Data integrity using linear combination for Hash algorithm

This Paper describes the construction of One-Way Hash Algorithm, which is also obtains better efficiency and security, compared with a particular conventional hash algorithm, Hash algorithm can be used to determine if two values are equal, a hash function maps keys to small values[1]. DILH algorithm using linear combination of matrices to find non-invertible matrix, that takes advantage about of the compact representation of a set of numbers in a matrix.

Event based Extensible Interactive Transparent Networking: Performance Study with Fast TCP Principles

Interactive Transparent Networking has been proposed to support a new generation of symbiotic applications that require advance interaction with the Network. In this mode advanced applications can subscribe to state- space event based feed from network protocol local end- points by interactive version of the network protocols. This enables a whole new range of high performance extensible adaptation which requires low-time constant feedback. In this paper, we show how classical TCP can be extended to support long delay high capacity pipe. We demonstrate a system that mimics FAST TCP however, without the usual extensive reengineering required by the original. It seems matching performance can be achieved with protocol interactivity.

End-to-end high performance mobility without infrastructure

Mobile IP offers disconnection free handoff by assuming availability of infrastructure. It requires intermediate software agents to be deployed in the Internet ahead of time. This infrastructure based mobility scheme though offers connectivity to itinerant hosts but incurs significant handoff and tunneling delays along with deployment costs. In this paper we investigate an alternate mobility scheme which does not require any such infrastructure and uses only end-point technique and interestingly provides much faster loss-free handoff. This end-to-end scheme named Interactive Protocol for Mobile Networks (IPMN) intelligently performs handoff based on information provided by MAC layer. The network address change is handled by renewing the existing connections by manipulating the TCP/IP stack at the end-points. It further uses a novel inter-protocol communication architecture to simplify end-point re engineering. However, it does not require any functional change in the TCP/IP protocol software. Besides, the difference in deployment scenarios, the IPMN offers blazingly fast event based handoff and much faster and simplified transport (no tunneling delay) than MIP. We provide a detail model based performance comparison between the two