Ufuk Usubütün

Computer Networks

Protocols

Cross-Layer Analysis

Greetings from New York City! This is Ufuk! And here’s my résumé

I am specializing in the analysis of network protocols (MAC and above) through analytical modeling and experimental evalutaion. Since the start of my PhD at NYU, I interned with Nokia Bell Labs (on routing optimization) and with AT&T Labs Research (on 3GPP RRC Layer Modeling). I will be joining Marvell Semiconductors for a Switch Architecture Design Engineer internship role during Summer 2024!

The publication page also contains pre-prints and presentation slides.

Inspiring reads:

Creating a Mathematical Theory of Computer Networks by Leonard Kleinrock.

The Design of Everyday Things by Don Norman.

news

Apr 8, 2024	I was awarded *The Dante Youla Award for Graduate Research Excellence* by the NYU Tandon ECE department for being the student who has made the most significant research contribution among all ECE graduate students in the past year!
Aug 4, 2023	Our paper Oblivious Routing Using Learning Methods is accepted for presentation at the IEEE GLOBECOM 2023 Conference!
Jun 5, 2023	Our paper Do Switches Still Need to Deliver Packets in Sequence won the BEST PAPER AWARD at the IEEE HPSR Conference!

selected publications

2023

Do Switches Still Need to Deliver Packets in Sequence? - BEST PAPER AWARD

Ufuk Usubütün, Fraida Fund, and Shivendra Panwar

In HPSR 2023 - IEEE 24th International Conference on High Performance Switching and Routing, 2023

Abs HTML PDF Code Slides

Internet switches become harder and costlier to build for higher line rates and switch capacities. In-sequence delivery of packets has traditionally been a constraint on switch designs because TCP loss detection was considered vulnerable to out-of-sequence arrivals. For this reason, extremely efficient and simple designs, such as the Load Balanced Birkhoff-von Neumann Switch, were considered impractical. However, we reevaluate this constraint considering modern TCP implementations with loss detection algorithms like Recent Acknowledgment (RACK) that are more resilient to out-of-order arrivals. In a set of testbed experiments representative of wide area core networks, we evaluated the performance of TCP flows traversing a load balanced switch that reorders some packets within a flow. We show that widely deployed and standard TCP implementations of the last decade achieve similar performance when traversing a load balanced switch as they do when there is no reordering. Furthermore, we also verified that an increase in the line rate leads to favorable conditions for time based loss detection methods, such as the one used in RACK. Our results, if further validated, suggest that switch designs that were previously thought to be unsuitable can potentially be utilized, thanks to the relaxation of the in-sequence delivery constraint.