|
Friday, October 21, 2005
Ajay Kulhari
Computer Science Department, University of Virginia
Advisor: Tarek F. Abdelzaher
Attending Faculty: Sang H. Son
Olsson 228E, 10:00 AM
A Master's Project Presentation
RT-Transport: A Real-Time Transport Protocol for Sensor Networks
ABSTRACT
The promising use of sensor networks in multiple application domains
motivates the development of communication protocols and interfaces that
provide the equivalent of a UNIX socket layer to network applications.
Towards that end, we present RT-Transport; a real-time transport service
for sensor networks that incorporates a congestion control mechanism
designed to enforce bounded-latency communication. Unlike congestion
control in TCP, which is achieved by throttling the source, the proposed
congestion control mechanism utilizes adaptive aggregation. In addition to
meeting time constraints, a new design criterion that arises in this
context is fairness with respect to the degree of aggregation across data
collected from different locales. Adaptive mechanisms are incorporated to
control the degree of aggregation such that it is uniform regardless of
path length and node location. We present the design and implementation of
the protocol and evaluate it on an experimental wireless sensor network
testbed based on Crossbow XSMs (eXtreme Scalable Motes) nodes. Results show
the efficacy of RT-Transport in enforcing both delay requirements and
fairness of aggregation. Other Recent and Upcoming Colloquia |