Dynamic Team and Game Theory for Congestion Control in High-Speed Networks
T. Basar,* R. Srikant,* E. Simiu
National Science Foundation, ANI-9813710

The main goal of this project is to develop a general theory of congestion control for high-speed communication networks, allowing for cooperation as well as noncooperation among the users. The focal point of the research is flow control of traffic that can adapt to the congestion state of the network by regulation of the input transmission rate of packets into the system. This involves the use of a rich set of tools from decentralized team theory, dynamic game theory, and robust identification and estimation. The framework adopted accommodates many realistic scenarios, such as variable feedback delays, unknown feedback delays, bursty sources, and multiple bottleneck nodes to accommodate max-min fairness.

Fair Scheduling and Admission Control for Shared-Channel Wireless Packet Networks
V. Bharghavan,* R. Srikant,* S. Shakkottai
National Science Foundation, ANI-9714685

Fair scheduling of delay and rate-sensitive packet flows over wireless channels is not addressed effectively by most contemporary wireline fair scheduling algorithms. Further, scheduling is closely connected to admission control and channel measurements since these are used to allocate a fraction of the channel's capacity to each flow based on its quality-of-service (QoS) requirements. In this project, we develop admission control and scheduling algorithms for wireless channels and study the performance of these by implementing them in testbed networks.

Internet Multimedia Technologies
R. Srikant,* S. Kunniyur
Nokia Research Center

We studied the impact of long-range dependence of real-time traffic on the lower priority best-effort traffic in a communication network. Using two different models of long-range dependence for the real-time traffic, we obtained expressions for the amount of time that it takes for the best-effort traffic to get its fair share of the available bandwidth after the real-time traffic enters a heavily congested state.

Resource Sharing and Performance Analysis Algorithms for Integrated-Services Networks
R. Srikant,* A. Dasylva, A. Das
National Science Foundation, NCR-9701525

Integrated-services communication networks that carry multiple traffic classes with different quality-of-service (QoS) requirements such as voice, video, and data are becoming a reality. We focus on two important issues in such networks: (1) resource sharing for traffic with different bandwidth requirements and (2) performance analysis algorithms to evaluate routing and admission control for such networks.

WINES-Wireless Network Simulator, Phases I and II
R. Srikant,* Y.C. Tseng
U.S. Army Research Office; Scientific Systems Co.

In this research project, we investigate simulation techniques to estimate the performance of data and voice traffic in ad hoc, wireless networks. The performance metrics of interest include delay and packet loss. The goal is to develop a simulator that can be easily adapted to simulate different wireless protocols and routing schemes based on different link metrics.