• home
• current students
• graduate
• events

Presenter: Dr. Rajeev Shorey - Research Staff Member, IBM Indian Research Laboratory, Indian Institute of Technology, New Delhi, India
Supervisor:

Date: Mon, February 3, 2003
Time: 14:30:00 - 15:30:00
Place: EOW 430

ABSTRACT

Abstract

We study the performance metrics associated with TCP-regulated traffic in multi-hop, wireless networks that use a common physical channel (e.g., IEEE 802.11). In contrast to earlier analyses, we focus simultaneously on two key operating metrics - the energy efficiency and the session throughput. Using analysis and simulations, we show how these metrics are strongly influenced by the radio transmission range of individual nodes. Based on our analysis of the performance of an individual TCP session, we then study how parameters such as the node density and the radio transmission range affect the overall network capacity under different operating conditions. Our analysis shows that capacity metrics at the TCP layer behave quite differently than corresponding idealized link-layer metrics. We then examine the sensitivity of capacity to various network parameters, protocols and applications. Finally, we study the comparative routing overheads of three ad hoc routing protocols, namely, AODV, DSDV and DSR. In contrast to earlier studies, we focus exclusively on the energy consumption and not on other metrics such as the number of routing packets. In particular, we study the 'range effects' of the three protocols, i.e., how changes to the transmission power and transmission radius affect the overall energy consumed by routing-related packets. Our studies show that the energy overhead of the three protocols varies with the transmission power in distinct and non-obvious ways.

For Further Information Contact
Dr. N.J. Dimopoulos (721-8902)