Title: AQM and Wireless QoS
Speaker: Ikjun Yeom (KAIST)
Date: 10. 26 (Fri) 4pm

In this talk, I present two recent researches on AQM (Active Queue Management) and wireless QoS. In the first part, I propose a new AQM scheme for reducing queue oscillation. Internet traffic is highly dynamic, and it is observed that queues in network routers oscillate due to the changes in network traffic over time. To reduce this oscillation, it is important to estimate the future traffic so that we can maintain the arrival rate at the departure rate. In this talk, I present how to estimate the amount of the future traffic accurately and determine the drop probability based on the estimation.
In the second part, I propose a framework for Assured Forwarding (AF) service in multi-hop wireless networks. Most current schemes for service differentiation in multi-hop wireless networks attempt to manipulate the contention window or inter-frame space to provide delay differentiation. However, those schemes are not adequate for AF service since delay differentiation may cause head of link blocking or out of order delivery. To provide forwarding assurance differentiation, the proposed framework consists of three components: a channel allocation scheme, a local queue management scheme, and a link-level forwarding assurance scheme. In this talk, I present the design and the performance of the framework.

Bio:
Ikjun Yeom received his B.S. degree in Electronic Engineering from Yonsei University, Seoul, South Korea in Feb. 1995, and the M.S. and Ph. D degrees in Computer Engineering from Texas A&M University in August 1998 and May 2001. He worked at DACOM co. from 1995 to 1996, and Nortel Networks in 2000. Currently, he is an assistant professor in the Department of Computer Science at KAIST since 2002. His research interests are in AQM, congestion control, TCP, and wireless networks.