Ahmed Helmy's Selected Publications
This is a short list of selected publications that are representative of
the major research thrusts and directions in my group. Some represent
recent research on: mobility modeling, robust geographic protocols,
contact-based discovery and query and multicast based mobility. Others
represent earlier work (started during my dissertation) on Stress testing,
network simulation and multicast routing.
Mobility Modeling and Analysis: (Simulation Tool: Link
to the IMPORTANT
mobility tool [contributed to NS-2])
- PATHS:
F. Bai, N. Sadagopan, B. Krishnamachary, A. Helmy, "Modeling
Path Duration Distributions in MANETs and their Impact on Routing
Performance", IEEE Journal on Selected Areas of
Communications
(JSAC), Vol. 22, No. 7, pp. 1357-1373, September 2004.
[Earlier version appeared in ACM MobiHoc, May 2003.]
- IMPORTANT:
F. Bai, N. Sadagopan, A. Helmy, "The
IMPORTANT Framework
for Analyzing the Impact of Mobility on Performance of
Routing for Ad Hoc Networks", AdHoc Networks Journal - Elsevier
Science, Vol. 1, Issue 4, pp. 383-403, November 2003.
[Earlier version appeared in IEEE INFOCOM, April 2003.]
- IMPACT:
W. Hsu, A. Helmy, "IMPACT:
Investigation of
Mobile-user Patterns Across University
Campuses using WLAN Trace Analysis", USC Technical
Report, July 2005. [Submitted to IEEE INFOCOM '06 for review]
(Mobility Library
'MobiLib' website)
- MAID: F. Bai, A. Helmy,
"Impact
of Mobility on Mobility-Assisted
Information Diffusion (MAID) Protocols", USC Technical Rreport,
July 2005. [Submitted to IEEE INFOCOM '06 for review]
Robust Geographic Protocols
- Black Listing: K. Seada, M. Zuniga, A. Helmy, B.
Krishnamachari,
"Energy-Efficient
Forwarding Strategies for Geographic Routing in Lossy Wireless
Sensor Networks", The Second ACM Conference on Embedded
Networked Sensor Systems (SenSys), November 2004.
- Face Routing Study:
Karim Seada, Ahmed Helmy, Ramesh Govindan, "
Modeling and Analyzing the Correctness of Geographic
Face Routing under Realistic Conditions", ACM Transactions on
Sensor Networks (Submitted August 2005)
[Earlier
version appeared in IEEE/ACM (IPSN), April 2004.]
- Robust
Geocast:
K. Seada, A. Helmy, "Efficient
and Robust Geocasting Protocols for Sensor Networks",
Journal of Computer Communications - Elsevier, Special
Issue on Dependable Wireless Sensor Networks. Accepted (Article In
Press).
[Earlier
Version in IEEE WCNC, March 2004]
- Rendezvous Regions:
K. Seada, A. Helmy, "
R2D2: Rendezvous Regions for Data Discovery", IEEE
Transactions
on Mobile Computing (Submitted) [Earlier
version appeared in IEEE/ACM IPDPS, April 04. Extended
double-column.]
Contact-based Resource Discovery and Query Resolution
- ACQUIRE:
N.
Sadagopan, B. Krishnamachari, A. Helmy, "Active
Query Forwarding in Sensor Networks (ACQUIRE)",
AdHoc
Networks Journal - Elsevier, Vol.3, No.1, pp.91-113,
January 2005
[Earlier version appeared in IEEE ICC SNPA workshop, May 2003.]
- Small Wireless Worlds: A. Helmy, "Small
Worlds in Wireless Networks", IEEE Communications
Letters, pp.
490-492, Vol. 7, No. 10, October 2003.
- MARQ:
A. Helmy, "
Mobility-Assisted Resolution of Queries in Large-Scale
Mobile Sensor Networks (MARQ)", Computer Networks Journal -
Elsevier Science
(Special Issue on Wireless Sensor Networks),
Vol. 43, Issue 4, pp. 437-458, November 2003.
- TRANSFER:
A. Helmy, "Efficient
Resource Discovery in Wireless AdHoc Networks: Contacts Do Help", Book
chapter in "Resource Management in Wireless Networking", Springer,
ISBN: 0-387-23807-7, Vol. 16, 2005. [Earlier Version in IEEE
Transactions on Vehicular Technology, Jan '05]
Systematic Stress Testing of Protocols
- TCP vs. tcp: S. Ebrahimi, A. Helmy, S. Gupta, "TCP
vs. TCP: a Systematic Study of Adverse Impact of Short-lived TCP Flows
on Long-lived TCP Flows", IEEE INFOCOM, March 2005.
- End-to-end STRESS:
A. Helmy, S. Gupta, D. Estrin,
'The
STRESS Method for Boundary-point Performance
Analysis of End-to-end Multicast Timer-Suppression Mechanisms',
IEEE/ACM Transactions on Networking (ToN), Vol. 12, No. 1, pp.
44-58, February 2004.
- Multicast Congestion Control Stress Study
K. Seada, A. Helmy, S. Gupta, "A
Framework for Systematic Evaluation
of Multicast Congestion Control Protocols", IEEE Journal on
Selected Areas in
Communications (JSAC), Special issue on
Protocol Design and Testing, Vol. 22, No. 10, Dec 2004.
Multicast-based Mobility
- M&M:
A. Helmy, M. Jaseemuddin, G. Bhaskara, "Multicast-based
Mobility: A Novel Architecture for Efficient Micro-Mobility", IEEE
Journal on Selected Areas in Communications (JSAC), Special Issue on
All-IP Wireless Networks, Vol. 22, No. 4, pp. 677-690, May 2004.
-
A. Helmy, "A Multicast-based Protocol for IP
Mobility Support", ACM SIGCOMM Int'l Workshop on Networked Group
Communication
(NGC), November 2000
Fair Packet Marking
- A. Das, D. Dutta, A. Helmy, A. Goel, J. Heidemann, "Low
State
Fairness: Lower Bounds and Practical Enforcement", IEEE
INFOCOM, March 2005.
-
A. Das, D. Dutta, A. Helmy,
"Fair
Stateless Aggregate Marking using Active
Queue Management Techniques",
IEEE Int'l Conference on Management of Multimedia Networks
and Services (MMNS),
pp. 211-223, October 2002. (Best Paper Award).
The Network Simulator (NS): (A link to the NS simulation package and the VINT
project)
- NS:
L. Breslau, D. Estrin, K. Fall, S. Floyd, J. Heidemann, A. Helmy, P.
Huang, S. McCanne, K. Varadhan, Y. Xu, H. Yu, "Advances in Network Simulation",
IEEE Computer, vol. 33, No. 5, p. 59-67, May 2000.
The Protocol Independent Multicast (PIM): (PIM Daemon
(pimd): A link to the PIM project and software)
- RP Bootstrap:
D. Estrin, M. Handley, A. Helmy, P. Huang, D. Thaler, "
A Dynamic Bootstrap Mechanism for Rendezvous-based Multicast Routing",
IEEE INFOCOM, Vol. 3, pp. 1090-1098, March 1999.
- PIM-SM Spec:
D. Estrin, D. Farinacci, A. Helmy, D. Thaler, S. Deering, V. Jacobson,
M. Handley, C. Liu, P. Sharma, L. Wei, "Protocol
Independent Multicast - Sparse Mode (PIM-SM): Protocol Specification,
Version 2",
RFC 2362 of the Internet Engineering Task Force (IETF), Inter-Domain
Multicast Routing (IDMR), June 1998.
Updated July 2005.