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

通信和网络技术在过去十年中经历了快速发展。然而，快速发展的同时也带来了许多问题。在这个研究项目中，我将研究如何提高各种通信网络的性能和安全性，例如对等网络、无线(包括ad-hoc和传感器网络)和TCP网络。在宽带网络中，可伸缩性是一个非常重要的问题，特别是在用户数量越来越大的情况下。对等网络(Peer-to-Peer，P2P)技术是解决这一问题的一种非常有前途的解决方案。我将对P2P系统的效率和激励机制进行研究。在无线网络中，当前系统的性能仍然远远不能令人满意。跨层优化被认为是未来无线网络良好性能的关键技术。我计划将其应用于多跳无线网络中的联合分布式调度和拥塞控制问题。安全问题一直是网络安全的重要问题。我将研究如何在无线自组织网络中处理自私或恶意用户的安全问题。在传统的排队网络中，我感兴趣的是对TCP拥塞控制下的网络进行排队分析，这将有助于我们改进适用于下一代网络的TCP协议。

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.