In current Internet, new generation of devices connecting to the network will be mostly through wireless such as notebooks, PDAs, phones, cameras and sensors. Wireless network has been a hot topic in these years. But there are still many networking issues. In terms of routing, we may need to know how to save bandwidth/energy, how to maximize capacity, how to make use of multicast nature of wLAN. In terms of traffic control, we may need better media access (MAC) and traffic control (TCP congestion control) to optimize bandwidth/energy or support QoS for multimedia. In terms of mobility, Internet never supported mobility well. In terms of access control/charging, wireless media is more precious than wired network!

In order to study various issues with wireless network, researchers need to conduct a lot of experiments or simulations. However, NS simulations
often assume idealized physical layer. A wireless test-bed is a must for applied research in this area. A serious test-bed needs larger scale (multiple floors and multiple buildings) and serious instrumentation, and it should also be a tool for easy management, and data collection.

Principal Investigator: Dah Ming Chiu
Co-I: John C.S. Lui and Wing Lau

Advanced Networking and Systems Research Group

1. Modeling and analysis of routing strategy to maximize capacity of ad-hoc multi-hop wireless nets (papers in IEEE ICNP05 and ACM Sigmetrics06)2. New traffic control algorithms for SoftMACs
3. New probabilistic routing and forwarding (based on Bloom filters) for mobility
4. Path aggregation to improve efficiency of VoIP

1. Determining the End-to-end Throughput Capacity in Multi-hop Networks: Methodology and Applications,
    Yan Gao, John C. S. Lui, and Dah-Ming Chiu, SIGMETRICS/Performance 2006, June 2006, Saint-Malo, France

2. The Fundamental Role of Hop Distance in IEEE802.11 Multi-hop Ad Hoc networks,
    Yan Gao, Dah-Ming Chiu, and John C. S. Lui, ICNP2005, Nov.2005, Boston, U.S.A.