Posts Tagged - project-paper

Project/Paper: UARA in edge routers: An effective approach to user fairness and traffic shaping

Date Completed: June 2009


The ever-increasing share of the peer-to-peer (P2P) traffic flowing in the Internet has unleashed new challenges to the quality of service provisioning. Striving to accommodate the rise of P2P traffic or to curb its growth has led to many schemes being proposed: P2P caches, P2P filters, ALTO mechanisms and re-ECN. In this paper, we propose a scheme named "UARA:User/Application-aware RED-based AQM" which has a better perspective on the problem: UARA is proposed to be implemented at the edge routers providing real-time near-end-user traffic shaping and congestion avoidance. UARA closes the loopholes exploited by the P2P traffic by bringing under control the P2P users who open and use numerous simultaneous connections. In congestion times, UARA monitors the flows of each user and caps the bandwidth used by "power users" which leads to the fair usage of network resources. While doing so, UARA also prioritizes the real-time traffic of each user, further enhancing the average user quality of experience (QoE). UARA hence centralizes three important functionalities at the edge routers: (1) congestion avoidance; (2) providing user fairness; (3) prioritizing real-time traffic. The simulation results indicate that average user QoE is significantly improved in congestion times with UARA at the edge routers.

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Project/Paper: IP Telephony

Date Completed: May 2005

Project Description:

This project builds on the work that went to the implementation part of my B.S. thesis. It covers technologies such as: Session Initiation Protocol, DiffServ QoS Architecture, SIP Network Modules Development, and Network Simulation. I have written a research paper based on the outcomes of this project with the title: “Utilizing DiffServ and SIP Contact Header for Real-time Fax Traffic Engineering”

Abstract—This paper focuses on the transmission of real-time fax in IP networks. For this purpose, the best current practices, i.e., utilization of the Session Initiation Protocol (SIP) as the signaling protocol along with ITU-T T.38 recommendation, are adopted. Two traffic engineering measures: utilization of SIP contact header and DiffServ QoS architecture, are proposed to streamline the implementation of the real-time FoIP. Network simulation results show that the proposed architecture, compared to the “Best Effort” service, has much less transmission time and jitter, and packets received are in correct sequence. Moreover, SIP contact header reduces load on network’s specialized resources. Therefore, this layout is a viable alternative for traditional PSTN fax.

Please click here to download the full paper.

Please click here to download the PowerPoint presentation of the paper.

The paper was accepted and presented at:

18th Annual Canadian Conference on Electrical and Computer Engineering, CCECE05, May 1-4, 2005, Saskatoon Inn, Saskatoon, Saskatchewan, Canada Please click here to download the conference program.

J-Sim network simulator has been utilized in this project. Please click here to download the simulation files.

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Project: Simulink and Code Generation using Real-Time Workshop : Rayleigh Fading Channel

Date Completed: September 18, 2003

Fading is one of the important obstacles which limits the wireless transmission. Deep fading will cause loss of signal at the receiver. The transmitted signal will arrive at the receiver antenna through multiple paths which causes what is known as multipath fading. Each path has its own delay and attenuation and the received signal amplitude is the collective effect of the signals arrived through different paths.

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Projects/Papers: Optimization Techniques in Electromagnetic Problems

Date Completed: August 05, 2003

The following papers are the results of a cooperation between Dr.Lotfi, the antenna and communications circuits labs instructor, and I. My work, for the main part, was helping in the implementation of the optimization algorithms in the projects and also comparing the obtained results with the ones produced by HP-HFSS software. I also had the opportunity to consult with Prof. Hojjat Kashani ,my Antenna course instructor, in the areas of antennas and microwave devices. The results of the application of the mentioned optimization techniques to some electromagnetic problems are documented in the following papers.

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