This activity deals with the performance evaluation of wired and wireless communication networks through modelling, analysis and simulation, and the development and evaluation of efficient resource management and traffic control mechanisms. Specific issues involve end-to-end Quality of Service (QoS) and service differentiation support over heterogeneous network technologies, charging of network transport services, traffic measurement and analysis, QoS and SLA (Service Level Agreement) monitoring, and seamless congestion control over wired and wireless networks.

In the area of congestion control for wired and wireless networks, we are investigating the application of economic modelling and congestion pricing for developing flexible, efficient, and robust mechanisms for resource control. The overall approach considers the use of a simple mechanism inside the network, such as Explicit Congestion Notification (ECN), for conveying congestion information to the end-systems, which respond independently based on their own requirements and needs. An important contribution we have made in this area is the extension of the above approach for wireless networks, including both 3rd generation networks based on Wideband CDMA and Wireless LANs based IEEE 802.11. This work takes into account the particular characteristics of wireless technology, and developes a framework for seamless congestion control over wired and wireless network, which takes into account the cost of battery power consumption. Our other interests in the area of wireless networking and mobile computing includes mechanisms for supporting service differentiation, media access control algorithms, performance and modifications of TCP over heterogeneous networks, and multihop wireless networks.