Modeling and analysis of peer-to-peer networks, wireless networks, and TCP/IP networks

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Communication and networking technologies have undergone rapid development in the past decade. However, the rapid development also poses many problems. In this research program, I will investigate how to improve the performance and security of various communication networks, such as peer-to-peer, wireless (including ad-hoc and sensor networks), and TCP networks. In broadband networks, scalability is a very important issue, especially when the user population is getting larger. Peer-to-Peer (P2P) technology is a very promising solution to this problem. I will study the efficiency and incentive mechanisms of P2P systems. In wireless networks, the performance of current systems is still far from being satisfactory. Cross-layer optimization has been believed to be the key technology for good performance in future wireless networks. I plan to apply it to the problem of joint distributed scheduling and congestion control in multi-hop wireless networks. Security has always been an important issue for networks. I will investigate the security problem of how to deal with selfish or malicious users in a wireless ad-hoc network. In the traditional queueing networks, I am interested in the queueing analysis of networks under TCP congestion control, which in return will help us to improve the TCP protocol for next generation networks.