Tel: (530) 752-5129
Fax: (530) 752-4767

Research Focus

1. Lightwave Networks
   The objectives are to design, develop, and analyze new/alternate architectures for the next generation of lightwave networks, which can be deployed over access, metropolitan, and wider areas. These networks will exploit the capabilities of improving lightwave technologies, e.g. dense wavelength division multiplexing (WDM) and optical cross connects (OXCs). Our current research covers backbone WDM mesh networks, metro rings, and access passive optical networks (PON).
2. Peer-to-Peer Networks
   We have developed a peer-to-peer file sharing system that provides the proper incentives to users to cooperate to mitigate flash-crowds. It is based on a new paradigm for Internet access called pseudo-serving, in which the p2p system grants a user a referral to where a copy of the requested file may be obtained if the peer agrees to serve some number of other users for a period of time specified in a contract. We are exploring methods to accurately determine the terms of the contract and the dynamics of such a system under centralized and distributed implementation strategies.
3. Internet QoS and Routing
   To support QoS at the network level, we are working on various issues associated with the differentiated service model. Specifically, we address marking techniques, bandwidth broker architecture, receiver- based resource provisioning, etc. QoS-aware multicasting is another thrust of our research on this topic. To complement the work at network level, we are also investigating QoS support issues at the application layer (overlay networks) and web servers. Our focus is also on designing large-scale routing infrastructure and network control plane that are robust, stable, secure, and with predictable performance. Our approach is driven by analysis of real measurements, wide-area routing dynamics, and failure characteristics.
4. Wireless Networks
   Research on wireless networks includes resource management in cellular, mobile ad hoc, and sensor networks. We are developing routing, medium access, and transport protocols for mobile ad hoc and sensor networks. Energy conservation and localization and the other thrusts of our efforts on sensor networks. Use of a vehicular ad hoc network for societal application is also being explored. We are also working on the improvement of wireless spectrum efficiency, scheduling, and QoS provisioning. Fundamental limits on connectivity and location discovery in sensor networks are also being explored.

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