Alhussein Abouzeid Research:
Systems: Communication Networks; Wireless Ad Hoc and Sensor Networks; Peer-to-Peer Networks.
Applied Theory: Stochastic Processes; Algorithm and Protocol Complexity; Multi-layer Optimization; Information Theory; Queuing Theory.
Project "Transport": Transport and Congestion Control in Hybrid and Wireless Ad Hoc Networks
TCP is the predominant Transport Control Protocol in the Internet, reportedly responsible for carrying 95% of Internet traffic. However, the wireless mobile network environment introduces two new components that were not considered in the design of TCP  for previous traditional wired networks; mobility and wireless communications. The problems that hinder TCP performance over wireless mobile networks can be traced to a mismatch between the inherent assumptions in the design of TCP and actual conditions of operation in the wireless mobile network environment. I have worked extensively on TCP-related problems. The work can be categorized depending on the attributes of the networking environment to (i) Wireless Access: situations where a possibly mobile user accesses an infrastructure network using a last-hop wireless link. (ii) Wired Infrastructure Network: Analysis of the interaction between multiple competing TCP and non-TCP flows over a network of traditional as well as Active Queue Management routers, with multiple transport-layer differentiated service classes. (iii) Mobile Wireless Network: Analysis of TCP with abrupt RTT changes. This work resulted in key new insights and analytical modeling contributions to the area of TCP modeling.
A.A. Abouzeid and S. Roy, “Stochastic Modeling of TCP in Networks with Abrupt Delay Variations”, Wireless Networks, vol. 9, no.5 pp. 509-524, September 2003.
A.A. Abouzeid, S. Roy and M. Azizoglu, “Comprehensive Performance Analysis of a TCP Session over a Wireless Fading Link with Queuing”, IEEE Transactions on Wireless Communications, vol. 2, no. 2, pp. 344-356, March 2003.
A.A. Abouzeid and S. Roy, “Modeling Random Early Detection in a Differentiated Services Network”, Computer Networks, vol. 40, no. 4 pp.537-556, November 2002.