Data plane aggregation
This work was aimed at developing a better understanding of the relations that exist between QoS provided as some aggregate level, e.g., a service class as in the Differentiated Services model, and the actual QoS that individual users experience. Of particular interest are models that allow explicit evaluation of individual QoS measures, and their use in identifying characteristics of user traffic that can result in significant differences between individual and aggregate QoS measures. This led to the development of models that allow the evaluation of the loss probability experienced by individual connections and when and why it differs from the aggregate loss probability. The environment that is assumed consists of a single FIFO queue where all the individual users belonging to the same service class are multiplexed. A separate but related perspective is that of security, namely, understanding the extent to which a single (or a few) user can affect the performance of many other users. In that context, we investigated the extent to which more sophisticated attack schemes can defeat existing mechanisms, and used that understanding towards developing better defenses.
Penn Contributors
Publications
- Y. Xu and R. Guerin, “Individual QoS versus aggregate QoS: A loss performance study.” IEEE/ACM Trans. Netw. Vol. 13, No. 2, April 2005. For a short version, see also the proceedings of INFOCOM’2002, New York, NY, June 2002.
- Y. Xu and R. Guerin, “On Evaluating Loss Performance Deviation: A Simple Tool and Its Practical Implications.” In Proceedings of 2nd international workshop on QoS in Multiservice IP Networks (QoS-IP 2003), Milano, Italy, February 2003.
- Y. Xu and R. Guerin, “On the Robustness of Router-Based Denial-of-Service (DOS) Systems.” ACM Computer Communication Review, Vol. 35, No. 3, July 2005.
- Y. Xu and R. Guerin, “A Double Horizon Defense Design for Robust Regulation of Malicious Traffic.” In Proceedings SecureComm 2006, Baltimore, MD, August 2006.